Could Secondary Tariffs Change the Economics of Buying Russian Oil?

Photo: MassDOT, Wikimedia Commons, public domain

01 A tariff that punishes the buyer, not the seller

Most tariffs punish a country for what it sells. The secondary tariff in the Graham-Blumenthal act — formally the Lindsey O. Graham Sanctioning Russia and Iran Act of 2026 — punishes a country for whom it buys from. Section 113 directs the president to impose tariffs of up to 100% ad valorem on all goods from any country that keeps buying Russian crude oil or natural gas, a rate that stacks on top of every other duty, fee and exaction already applicable.

The trigger is deliberately mechanical. A “covered country” is one that knowingly made new purchases of Russian-origin crude or gas on or after 30 days from enactment and that ranked among the five largest importers by volume over the trailing 12 months — or among the top five facilitators of Russian oil sanctions evasion. On current trade data that list is China, India, Azerbaijan, Hungary and Slovakia.

Analysis — not prediction. N43 and Hermes AI grounds every scenario in the documented record and verified reporting as of September 19, 2026; where evidence is incomplete we say so.

02 The arithmetic of a threat

Why this mechanism is different from prior sanctions waves is the size of the hostage. The United States is the largest consumer import market on earth; a 100% tariff on all goods from a covered country is not a sanction on Russia — it is an offer the buyer must price. For China, which purchases roughly 50% of Russia's crude oil exports, and India at about 37%, the exposed trade is not energy but everything else they sell to America.

The act gives the US Trade Representative a dial, not a switch: rates can be adjusted between 0% and 100% as a country increases or decreases its Russian purchases, with reviews every 180 days. There is a carve-out for countries importing less than 15% of Russia's gas exports and demonstrably cutting back, and European allies that slashed Russian gas reliance get explicit cover.

03 India has run this gauntlet before

The precedent matters because it was set inside the last year. In August 2025, Washington imposed an additional 25% tariff on Indian goods explicitly because India was buying Russian oil, taking the combined rate on many Indian imports to 50%. That levy was removed in February 2026 after India agreed to stop buying Russian crude as part of a broader trade deal, and the reciprocal tariff on Indian goods was cut to 18%.

So the tested question — does New Delhi respond to tariff pressure on its Russian oil habit? — has a tested answer: yes, at the margin, and quickly. Indian refiners treat Russian Urals as a discount barrel, not a strategic commitment; cargoes are bought spot, on price. What the earlier episode demonstrated is that when the discount stops compensating for the tariff exposure, the cargoes stop sailing.

The wrinkle this time is that the February deal reportedly frayed, and India has resumed at least some Russian purchases — which is precisely the fact pattern Section 113 was drafted around. The 30-day post-enactment trigger means any covered-country buyer that wants out must decide fast.

04 China is the harder case

Beijing is the test the act cannot dodge. China's purchases are roughly half of Russia's crude exports — the single largest revenue line in the Kremlin's war budget. But unlike India, China holds its own leverage: it is America's largest goods supplier and largest single-country import source, and a 100% tariff on Chinese goods is a shock to US consumers as much as to Chinese exporters. The deterrence runs in both directions.

That mutual exposure is why the drafters built the escalatory ladder into the statute rather than a single cliff: the USTR's 0-to-100 dial lets Washington calibrate — a 25% secondary tariff on China is a bruising trade action; 100% is economic siege. The 180-day review cycle converts what was episodic leverage into standing, scheduled pressure.

05 Does it actually change the economics?

Strip away the statecraft and the question is a spread calculation. Russian crude sells at a discount to Brent; a buyer's incentive is the discount minus the sanctions risk. Secondary tariffs attack the second term: every point of tariff exposure must be compensated by a deeper Russian discount, and Moscow's budget is the party that pays it. The mechanism does not need to end Russian exports — it needs to make Russian oil cheap enough for the seller to bleed.

Two honest caveats. First, high oil prices — which the Iran conflict's seventh month has delivered — widen Russia's tolerance for discounts; a seller's market blunts the spread weapon. Second, enforcement depends on transparency: buyers can launder origin through ship-to-ship transfers and rebranded blends, which is why the same act simultaneously hammers the shadow fleet doing the laundering.

06 The sovereignty fight inside Washington

The act passed the Senate 86-11 and the House 262-159, but the vote counts hide a real fight. Critics — Jeffries, Wyden, Paul and others — objected that Congress was handing the executive “unfettered authority to visit more tariffs on the world”, a power that outlives the Russia context and can be aimed at the EU or anyone else. The counter was process: any presidential waiver requires written certification to Congress that the action serves the national interest, and Warnock secured a commitment that tariffs lift once a country stops buying Russian oil or aiding evasion.

That is the constitutional trade this law makes: maximum deterrence, purchased with maximum executive discretion. The buyers it targets now run the same calculation Washington did — and the 30-day clock is already running.

07 What to watch

Watch the 30-day post-enactment window: cargoes contracted inside it set the first covered-country determinations. Watch Indian refinery tenders — the fastest real-time indicator of whether New Delhi folds again. Watch USTR's first rate announcements: the initial dial settings, not the statutory maximum, are the true policy signal. Watch the Urals discount widen against Brent as sellers absorb the risk premium. And watch whether China tests the waiver clause — a Beijing request for national-interest certification would be the act's first great stress test.