Ukrainian and US negotiators gave an upbeat assessment of talks in Berlin on ending Russia’s war, with a top aide to President Volodymyr Zelenskiy voicing optimism that the sides could close in on an agreement by the end of the day.

President Volodymyr Zelenskiy offered to drop Ukraine's aspirations to ‌join ​the NATO military alliance as he held five hours of ‌talks with U.S. envoys in Berlin on Sunday to end the war with Russia...