Ukrainian troops retook a wide swath of territory from Russia on Monday, pushing all the way back to the northeastern border in some places, and claimed to have captured many Russian soldiers as part of a lightning advance that forced Moscow to make a hasty retreat. A Ukrainian presidential adviser said there were so many prisoners of war that the country was running out of space to accommodate them.
Read MoreAs Russian forces consolidate their positions, several Ukrainian cities came under bombardment as hopes of a quick end to the war diminish
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