Officials say Ukraine and Russia have targeted each other with long-range strikes amid continuing uncertainty about whether an agreement to stop their more than three-year war is within reach.

Russia said on Monday it was waiting for a signal from Ukraine to say it was willing to hold direct negotiations to end their war, but had not seen any signs of movement.

The Trump administration has been trying to broker a peace deal between Ukraine and Russia to halt the three-year conflict.

President Donald Trump said on Sunday that he's giving "two weeks" for Ukraine and Russia to make a deal as Kyiv is losing too many people to continue fighting amid the ongoing war with Russia, adding that he's disappointed in Russian President Vladimir Putin for continuing the conflict after peace negotiation talks.

US President Donald Trump has said he thinks his Ukrainian counterpart Volodymyr Zelensky is willing to give up Crimea to Russia as part of a peace deal - despite Kyiv's previous rejections of any such proposal.