Will the U.S. unleash 100% tariffs on Russian oil and gas—while Moscow warns trade war is spreading?

On Sept. 10, Ukraine’s sanctions commissioner Vladyslav Vlasiuk said it remains unclear whether the U.S. House of Representatives will vote next week on sweeping legislation that could impose tariffs of up to 100% on countries buying Russian oil and gas. The proposal, as described by Vlasiuk, targets third-country demand for Russian energy rather than only direct U.S. imports, effectively turning tariff policy into an enforcement mechanism for sanctions. In parallel, Kremlin spokesman Dmitry Peskov told reporters that global markets are broader than Latvia alone in response to Riga’s grain-related decision, arguing that alternative destinations always exist. Peskov also framed Latvia as “inspired” by transatlantic tariff methods, asserting that trade wars are continuing. Geopolitically, the U.S. tariff plan would tighten the net around Russia’s energy revenue streams by raising the cost of Russian barrels and molecules for buyers outside the U.S. That shifts leverage toward Washington and away from Moscow, while also testing European and other importers’ willingness to absorb higher energy costs or reroute supply. The Kremlin’s messaging—downplaying the significance of Latvia’s decision and emphasizing substitution—signals an attempt to reduce perceived effectiveness of Western economic pressure and to keep partners from panicking into rapid, politically costly realignments. Ukraine benefits directly if the measure constrains Russian energy flows, while Russia faces a potential revenue shock and greater friction in its trade corridors. Latvia and other European states are caught in the middle: they are both targets of Moscow’s narrative and potential beneficiaries if they can attract redirected commodity flows. Market implications are likely to concentrate in European energy pricing, shipping and insurance premia, and the broader sanctions-and-tariffs risk premium embedded in commodity-linked equities. If tariffs reach “up to 100%” on third-country purchases of Russian oil and gas, the direction of pressure would be toward higher effective costs for Russian-linked supply, with knock-on effects for benchmark spreads and regional gas pricing. The grain reference is a secondary but relevant signal: Kremlin rhetoric suggests that commodity routing decisions (including grain) are becoming part of the same economic contest, which can amplify volatility in food and feed markets. In FX and rates, the immediate transmission is less direct, but risk-off sentiment around energy and trade friction can support safe-haven demand and raise hedging costs for exporters and importers exposed to sanctions compliance. Overall, the cluster points to a tightening sanctions regime with a trade-war overlay that can move both physical commodity flows and financial risk pricing. Next, the key trigger is whether the U.S. House schedules and passes the tariff legislation next week, and whether the final text specifies scope, enforcement, exemptions, and timelines for Russian oil and gas buyers. Watch for follow-on statements from U.S. lawmakers and relevant agencies on implementation mechanics, including how “countries buying Russian oil and gas” will be defined and measured. On the Russian side, monitor whether Moscow escalates retaliatory rhetoric into concrete countermeasures affecting European commodity routing, such as additional pressure on ports or logistics chokepoints. For markets, track changes in European gas benchmarks, crude differentials tied to Russian grades, and shipping/insurance spreads for routes that historically carried Russian energy. If the vote is delayed or softened, volatility may de-escalate; if it advances with broad coverage, escalation risk rises quickly as importers scramble to re-contract and re-route supply.

Geopolitical Implications

• 01

  If enacted, the tariff approach would reduce Russia’s ability to monetize energy through third-country intermediaries, shifting bargaining power toward Washington and sanctioning coalitions.

• 02

  Kremlin messaging suggests an effort to prevent partner states from concluding that Western economic pressure is decisive, thereby slowing alignment and compliance behavior.

• 03

  Latvia’s grain decision being folded into the same narrative indicates a broader strategy of using commodity routing and trade policy as geopolitical leverage.

• 04

  Escalation risk rises if the U.S. measure is broad and fast-moving, forcing importers into politically sensitive energy substitutions.

Key Signals

• —Whether the U.S. House schedules and advances the tariff bill next week, and whether amendments narrow or expand coverage.
• —Official guidance on how “countries buying Russian oil and gas” will be quantified and enforced (contracts, volumes, customs data, or sanctions lists).
• —Any Russian move from rhetoric to operational countermeasures affecting Baltic logistics or commodity routing.
• —Real-time changes in European gas benchmarks (TTF) and crude differentials tied to Russian grades, plus shipping and insurance spread widening.