US President Donald Trump warned Russia he is prepared to impose strong economic measures over the war in Ukraine in a combative speech to the UN General Assembly on Tuesday.

Trump’s warning to Russia came with a twist. He said he wants US allies to impose the same measures on Russia he is proposing to try to force Russian President Vladimir Putin to pull back from the biggest war in Europe since World War Two.

The US President has warned about the possibility of sanctions on Russia several times but has yet to follow through. Lately he has demanded Europe stop all Russian oil purchases before he will take action.

“In the event that Russia is not ready to make a deal to end the war, then the United States is fully prepared to impose a very strong round of powerful tariffs, which would stop the bloodshed, I believe, very quickly,” he said.

But for the measures to be effective, he said, “European nations, all of you gathered here, would have to join us in adopting the exact same measures.”

He planned a meeting later in the day with Ukrainian President Volodymyr Zelenskiy.