"I feel it, we understand it, and it will be a challenge for all of us. And we will protect Ukraine in these matters as much as possible. But it will be very difficult for us," he said, stressing the importance of finding a solution for cities and towns along the lines of contact to avoid a situation similar to the division of Berlin and the

U.S. President Donald Trump and Ukrainian President Volodymyr Zelenskiy agreed on Wednesday to work together to end Russia's war with Ukraine, in what the White House described as a "fantastic" one-hour phone call.