Ukraine and its European allies signaled that key sticking points remained in U.S.-brokered peace talks even as senior officials hailed progress in winning more favorable terms for Kyiv from a proposal backed by President Donald Trump.

A push by the Trump administration to end Russia's war on Ukraine appears to make headway, with Kyiv saying Zelenskyy could visit D.C. within days to finalize a deal.

Polish Prime Minister Donald Tusk said, “it would be good to know for sure who is the author of the plan,” amid tensions over elements that mirror long-standing Russian demands.

Top U.S. and Ukrainian officials said Sunday they were making progress toward ending the Russia-Ukraine war but provided scant details.