The daring campaign Ukraine launched last summer to seize and occupy Russian territory appears to be nearing an end.

President Zelenskiy said his troops in Kursk were not surrounded, but said there might be a new Russian attack on Ukraine's northeastern Sumy region.

LONDON/KYIV (Reuters) - Tens of thousands of Ukrainian troops who smashed into Russia last summer and took control of a swathe of territory there are nearly encircled by Russian forces and cut off from their main supply lines, open source maps showed on Friday.