U.S. President Donald Trump urged Kremlin leader Vladimir Putin on Friday to spare Ukrainian troops that Russia is pushing out of its Kursk region, an appeal Putin said he would honor if they surrendered.

Russia’s stalling contrasted with Trump’s rush for a valuable breakthrough as his trade policies set off stock market slumps and cast a cloud over the economy. “I think we’re going to be in very good shape to get it done. We want to get it over with,” Trump said at the Oval Office on Thursday, in an outburst of optimism that jarred with reality.

Vladimir Putin told a news conference that he agreed with the idea of a ceasefire, but he immediately spelled out tough conditions that appeared to rule out agreement.