US President Donald Trump started the week declaring a diplomatic breakthrough in his bid to prod Moscow and Kyiv closer to peace, announcing he had begun arranging for direct talks between Russian President Vladimir Putin and Ukrainian President Volodymyr Zelenskyy. Four days later, his optimism has diminished. Russia’s top diplomat made it clear on Friday that Putin won’t meet with Zelenskyy until the Ukrainians agree to some of Moscow’s longstanding demands to end the conflict.

It’s a stinging setback for Trump, who had been touting his diplomatic blitz as resulting in indisputable momentum for a deal to halt a conflict he vowed as a candidate to end on Day One in office. Trump said on Friday he expected to make a decision on his next actions in two weeks if direct talks aren’t scheduled. He raised the possibility of imposing new sanctions or tariffs on Russia, a threat he has previously floated but not followed through on.

“We’re going to see whether or not they have a meeting,” Trump told reporters in an Oval Office appearance. “It’ll be interesting to see. If they don’t, why didn’t they have a meeting, because I told them to have a meeting. But I’ll know what I am going to do in two weeks.”