U.S. President Donald Trump has declared he is ready to hit Russia’s oil sector with sweeping sanctions—but only if NATO allies first stop importing Moscow’s crude.

In a post over the weekend, Trump criticized member nations that continue purchasing Russian energy, saying it undermines the alliance’s ability to pressure the Kremlin. “It weakens your bargaining power,” he wrote, urging NATO to act collectively before Washington steps in with “major” sanctions.

Several European nations have already reduced or halted Russian oil imports, but resistance remains from Hungary, which has a long-term supply deal with Gazprom running through 2036. Hungarian Prime Minister Viktor Orban, a Trump ally who maintains close ties with Vladimir Putin, has blocked tougher EU proposals targeting Russia’s energy sector.

Trump’s message comes as frustration grows over the war in Ukraine. His recent summit with Putin in Alaska produced no breakthrough, while Russia has intensified airstrikes on Kyiv in the days since. A planned three-way meeting with Ukrainian President Volodymyr Zelenskiy also fell through.

Beyond sanctions, Trump floated the idea of steep tariffs—up to 100%—on China and India for their continued purchases of Russian oil. He suggested the tariffs could be lifted once the conflict ends. But such a move risks reigniting trade tensions with Beijing, just as U.S. officials prepare for talks with Chinese counterparts in Madrid.

The shift marks a harder line from Trump, who previously held back on new sanctions while seeking peace talks. With Russia escalating its offensive, pressure is mounting on NATO to close ranks and present a united front.