This would appear to represent sanctions success: if export capacity is reduced by 40%, surely revenues must decline proportionally. Yet they have not, and understanding why reveals the complexity of commodity markets and the limited tools available to Western policymakers.

The Revenue Surge

Russian oil revenues have surged for three interconnected reasons. First, global oil prices have risen due to Iran war-related supply concerns, benefiting all producers including Russia. Second, Moscow has successfully redirected sales to Asian buyers willing to pay premiums for discounted Russian crude—premiums that have narrowed as alternative supplies tighten. Third, the shadow fleet that remains operational has become more efficient at evading detection and operating outside Western oversight.

The result is that while Russia moves less oil than before the war, it captures more revenue per barrel moved. The $18 billion February figure compares to approximately $14 billion in February 2023 and $11 billion in February 2024—a steady increase despite growing sanctions pressure.

Western officials have privately acknowledged that current sanctions architecture cannot prevent Russian oil sales entirely without triggering global supply shocks that would devastate European and American economies. The strategy instead aims to limit Russia's revenue per barrel through price caps and to increase Moscow's costs through logistics disruption. By this measure, sanctions have achieved partial success—Russian oil sells for $10-15 below Brent crude benchmarks, and transport costs have increased significantly.

But "partial success" in sanctions policy often means "sufficient revenue to fund military operations"—which remains the case for Russia.

The Shadow Fleet Evolution

The shadow fleet itself has evolved in response to Western pressure. Early in the war, these vessels operated relatively openly, with transparent ownership structures and standard insurance arrangements. As sanctions tightened, the fleet adapted: incorporating in jurisdictions beyond Western reach, disabling transponders to avoid tracking, conducting ship-to-ship transfers at sea, and developing alternative insurance mechanisms through Russian and Chinese providers.

Naval intelligence officials describe a cat-and-mouse game in which Western enforcement identifies and blacklists vessels, prompting operators to create new corporate structures and re-register ships under different flags. The UK's recent authorization for the Royal Navy to board suspected shadow fleet vessels represents an escalation in this contest, though operational challenges make widespread interdiction unlikely.

The fleet's resilience reflects broader realities about sanctions evasion. Where sufficient economic incentives exist—and Russian oil represents billions in potential profits—sophisticated actors will find methods to circumvent restrictions. Complete enforcement would require a naval blockade or military action against non-compliant countries like China and India—options no Western government seriously considers.

Policy Implications

The Russian oil situation exposes an uncomfortable truth about economic sanctions as a tool of statecraft: they impose costs on targets but rarely achieve decisive effects absent military action or regime collapse. Russia continues funding its war in Ukraine through oil revenues despite unprecedented Western sanctions—not because sanctions have failed entirely, but because their structural limitations prevent the comprehensive economic isolation that would be required to force policy change.

Some analysts advocate for stronger enforcement, including secondary sanctions against Chinese and Indian entities that facilitate Russian oil trade. This approach carries significant risks: alienating India, a country the West hopes to cultivate as a counterweight to China, and provoking economic retaliation from Beijing that could devastate Western economies more than it harms China.

Alternatively, Western governments could accept current sanctions as imposing sufficient costs to complicate Russian war financing while acknowledging they cannot prevent it entirely. This represents the de facto policy, even as official rhetoric maintains that sanctions aim to cripple Russian capacity.

Looking Forward

The 40% reduction in export capacity may eventually translate into reduced revenues as Russia exhausts workarounds and global oil markets stabilize. But recent trends point in the opposite direction: revenues rising despite capacity constraints, suggesting that current sanctions architecture has reached the limits of its effectiveness without broader international participation or more aggressive enforcement.

For policymakers, the lesson is sobering. Economic sanctions work best when they complement military or diplomatic strategies, not as substitutes for them. In the Russian case, sanctions have imposed real costs but have not prevented Moscow from funding its war effort. Whether Western governments are willing to escalate to more aggressive enforcement—with attendant risks of confrontation and economic disruption—remains an open question. The answer will determine whether sanctions eventually contribute to ending the war or merely serve as symbolic gestures while Russia adapts and endures.