Russian Oil Back in Play: US Sanctions Crack Under Iran War Pressure

The US-Israeli military strikes on Iran launched on February 28, 2026, have sent global oil markets into turmoil and placed Russian crude exports at the center of a rapidly shifting energy landscape. With the Strait of Hormuz effectively closed and Iranian production offline, Russia has emerged as one of the few major exporters positioned to fill the gap, reversing months of declining revenues and tightening sanctions pressure.

Before the conflict, Russia was facing its worst oil revenue outlook since the full-scale invasion of Ukraine began in 2022. In January 2026, state oil and gas revenue fell to a four-year low of 393 billion rubles ($5 billion), and the federal budget recorded a record monthly deficit of 1.7 trillion rubles ($21.8 billion). The price of Russia's flagship Urals crude had dropped to around $40 per barrel in late February, far below the $59 benchmark assumed in the 2026 federal budget. Sanctions imposed by the United States, the European Union, and the United Kingdom had severely constrained Moscow's ability to sell at competitive prices.

The sanctions architecture against Russian oil has grown significantly over the past four years. In late 2025, the EU shifted from a fixed oil price cap to a dynamic mechanism, setting the threshold at 15% below the six-month average of Urals crude, which lowered the effective cap to around $44 per barrel by mid-January 2026. The US sanctioned Russia's two largest oil companies, Rosneft and Lukoil, in October 2025, threatening secondary sanctions against any foreign entity purchasing from them. The UK banned imports of petroleum products refined from Russian-origin crude in third countries, and both the EU and UK sanctioned Chinese and Indian refineries involved in processing Russian oil, including Shandong Yulong Petrochemical and Nayara Energy.

Despite these measures, Russia maintained substantial export volumes through a network of buyers concentrated in Asia. Since December 2022, China has purchased 48% of Russia's crude oil exports, followed by India at 38%, Turkey at 6%, and the EU at 6%. In January 2026, China remained the dominant buyer, importing EUR 4 billion in Russian crude. Russia's seaborne crude exports to China hit a record 1.86 million barrels per day that month, up 46% year-on-year. Moscow overtook Saudi Arabia as China's top supplier, shipping 56% more crude than Riyadh. China's imports of Urals grade crude, previously disfavored by Chinese refiners, doubled to their highest monthly level ever recorded.

India, the second-largest buyer, imported EUR 2.2 billion of Russian hydrocarbons in January 2026, though volumes had declined 12% from the previous month following US pressure. The Trump administration imposed a 25% tariff on Indian goods in August 2025, partly in response to India's continued purchases of Russian crude. In early February, Trump announced a trade deal cutting tariffs to 18% in exchange for India halting Russian oil imports. The Jamnagar refinery, one of India's largest, completely paused Russian crude imports in January.

Turkey occupies a unique position in the Russian oil trade. As a NATO member, it has avoided the direct sanctions and tariffs that the US imposed on India and China for their purchases of Russian energy. Yet Turkey is the largest buyer of Russian refined petroleum products globally, absorbing 27% of total Russian oil product exports since December 2022. In January 2026, Turkey imported a total of EUR 2 billion in Russian hydrocarbons, with oil products making up 40% of those purchases.

Beyond direct buyers, a network of intermediary countries helps obscure the Russian origin of crude oil before it reaches end consumers. Malaysia has become the world's largest hub for ship-to-ship transfers of sanctioned oil. Shadow fleet tankers routinely anchor in waters off Penang and in the South China Sea near the Malacca Strait, where Russian crude is offloaded onto clean vessels and re-documented as being of a different origin. On January 29, 2026, Malaysia's Maritime Enforcement Agency boarded two tankers transferring approximately 2 million barrels off the coast of Penang. One of the vessels, the Rcelebra, was already on European sanctions lists for smuggling Russian oil. The crew included nationals from China, Myanmar, Iran, Pakistan, and India. Despite this operation, Lloyd's Shadow Fleet Tracker data showed an increasing flow of stateless tankers loaded with Russian oil continuing to anchor in Malaysian waters. The United Arab Emirates serves a similar function through Dubai's free trade zones, where simplified customs procedures, blended cargo facilities, and alternative financing channels allow traders to mix Russian crude with other grades, breaking supply chain traceability. Indian and Turkish refineries have also acted as laundering points, purchasing discounted Russian crude and re-exporting refined products such as diesel and jet fuel to the EU, US, UK, and Australia. The EU and UK moved to close this loophole in January 2026 by banning imports of petroleum products refined from Russian-origin crude in third countries. However, Turkey itself remains free from direct Western sanctions. The bipartisan Sanctioning Russia Act introduced in Congress in April 2025, which would authorize tariffs of up to 500% on countries purchasing Russian energy, has not yet been passed into law.

The shadow fleet has been central to Russia's ability to maintain export volumes despite Western restrictions. This network of aging tankers operates with obscured ownership structures, alternative insurance arrangements, and frequently switched flags and transponder signals. By January 2026, 68% of Russian crude oil exports were carried by sanctioned shadow vessels, while only 24% traveled on G7-affiliated tankers. Ukraine's government cataloged 1,337 ships operating as part of the fleet as of February 2026.

Since late 2024, the shadow fleet has faced growing physical and legal threats. Germany seized the tanker Eventin in March 2025 after it drifted into German waters carrying 100,000 tons of sanctioned Russian crude. Estonia's navy captured the flagless tanker Kiwala in April 2025. France seized the tanker Boracay near Saint-Nazaire in September 2025 and the tanker Grinch in the Alboran Sea in January 2026, with President Emmanuel Macron declaring that shadow fleet activities financing the Ukraine war would not be tolerated. Finland captured the freighter Fitburg on December 31, 2025, suspected of damaging undersea cables linking Estonia and Finland.

The United States escalated its enforcement dramatically in January 2026. On January 7, US Navy SEALs and Coast Guard forces seized the tanker Marinera (formerly Bella 1) near Iceland after a weeks-long pursuit that began off Venezuela. The same day, forces seized the M/T Sophia in the Caribbean. Further seizures followed: the MV Olina on January 9, the Veronica on January 15, and the Sagitta on January 21. In February, US Indo-Pacific Command captured the Suezmax tanker Aquila II in the Indian Ocean, carrying approximately 700,000 barrels of crude destined for China. Russia had attempted to protect the Marinera by dispatching a submarine and naval vessel, and its Foreign Ministry called the seizure a violation of international maritime law.

Ukraine also intensified its campaign against the fleet. On November 28, 2025, Ukraine's Security Service (SBU) struck tankers Kairos and Virat off the Turkish Black Sea coast using Sea Baby naval drones. On December 10, forces hit the tanker Dashan, valued at approximately $30 million. On December 18, Ukraine conducted its first claimed attack in the Mediterranean, striking the tanker Qendil over 2,000 kilometers from Ukrainian territory. On January 8, 2026, the tanker Elbus was hit by a drone off Turkey's coast. Russia's Ministry of Transport described these attacks as international terrorism.

The Iran war reversed Russia's deteriorating oil revenue trajectory almost overnight. As Brent crude surged above $100 per barrel on March 9, Russia's Urals crude rose from its pre-war low of $40 to around $70 per barrel. Before the conflict, Russian oil traded at a discount of $10 to $13 relative to Brent. After the strikes began, that gap narrowed to a premium of $4 to $5, according to Reuters. Analysts at MST Marquee estimated that if prices averaged $90 per barrel, Moscow could collect roughly $55 billion in additional revenue compared to budget forecasts.

The US response to the oil price shock introduced a series of escalating measures. On March 5, Treasury Secretary Scott Bessent announced a 30-day waiver allowing Indian refiners to purchase sanctioned Russian crude already loaded on vessels, describing it as a short-term measure to prevent Iran from holding global energy hostage. On March 9, President Trump signaled that broader sanctions relief could follow, telling a House GOP conference that sanctions on "some countries" would be temporarily lifted until the situation stabilized. Then, on March 12, the Treasury Department expanded the waiver globally, issuing a license authorizing all countries to purchase Russian crude and petroleum products loaded on vessels on or before March 12, valid through April 11. According to Bloomberg, approximately 30 tankers in Asian waters carry at least 19 million barrels of Russian crude and 310,000 tons of refined products, mainly naphtha and diesel, while Russian envoy Kirill Dmitriev claimed around 100 million barrels of Russian oil were in transit worldwide. Dmitriev, who met with US envoys Steve Witkoff and Jared Kushner in Florida on March 11, declared that the US was "effectively acknowledging the obvious: without Russian oil, the global energy market cannot remain stable."

The decision drew fierce opposition from multiple quarters. Congressional Democrats led the charge: Rep. Sam Liccardo (D-CA) and Sen. Ruben Gallego (D-AZ) wrote to Bessent on March 9, calling the initial India waiver "dangerous, self-defeating, and indefensible" and warning it rewarded Russia while Moscow was reportedly sharing intelligence with Iran to target American forces. Ten Democratic senators on the Banking Committee, including Elizabeth Warren and Jack Reed, demanded a congressional hearing with Bessent by month's end, accusing the administration of violating the Countering America's Adversaries Through Sanctions Act. Even some Republicans broke ranks: Armed Services Committee Chair Roger Wicker (R-MS) said he strongly disagreed with the sanctions relief. European allies reacted with alarm. French President Macron declared that the Hormuz crisis "in no way" justified lifting Russia sanctions. European Commission President von der Leyen echoed that view after a G7 call. Commissioner Dombrovskis called the move "self-defeating." The UK affirmed it would not ease its own sanctions, calling it a "critical moment in the Russian aggression against Ukraine."

In parallel, the administration and its allies deployed other tools to stabilize markets. On March 11, the IEA's 32 member countries unanimously agreed to release 400 million barrels from emergency reserves, the largest coordinated drawdown in the agency's history, with the US contributing 172 million barrels from the Strategic Petroleum Reserve over 120 days. The White House also floated a temporary suspension of the Jones Act to allow foreign-flagged ships to carry fuel between US ports. Despite these measures, Brent crude remained stubbornly above $100 a barrel, as analysts warned that no amount of reserve releases could fully offset the near-total shutdown of the Strait of Hormuz.

The EU's 20th sanctions package, proposed on February 6, 2026, introduced a blanket ban on maritime services for all vessels carrying Russian crude, rendering the G7 price cap effectively redundant within EU jurisdiction. An additional 42 shadow fleet vessels were blacklisted, bringing the EU total to 640.

As of January 2026, the UK had sanctioned 520 shadow fleet vessels, banning them from accessing British ports, revoking any UK registration, and prohibiting UK-based companies from providing insurance, brokerage, or maintenance services. Given London's central role in global maritime insurance through Lloyd's, the loss of British coverage forces sanctioned vessels to rely on more expensive and less reliable alternative insurers. The UK also provided operational support for the US seizure of the Marinera in January 2026, deploying RAF surveillance aircraft and the Royal Fleet Auxiliary vessel RFA Tideforce, marking the first time British forces directly assisted in intercepting a shadow fleet tanker. The UK Ministry of Defence reported that these combined measures had contributed to a 27% decline in Russia's critical oil revenues compared to October 2024, before the Iran conflict reversed that trend.

The conflict has created a paradox in sanctions policy. Western governments spent four years building an increasingly sophisticated framework to constrain Russian oil revenue, only to see the Iran war hand Moscow a windfall that could amount to tens of billions of dollars. European Council President Antonio Costa summarized the situation plainly, stating that Russia was the only winner in the Iran war, gaining new resources to finance its war against Ukraine while profiting from the diversion of military capabilities away from the Ukrainian front.