ZAGREB (Reuters) – A month has passed since Vjekoslav Prebeg was freed from Russian captivity in a prisoner swap between Ukraine and Russia, and the 40-year-old Croatian still looks shaken as he recounts his experiences. A soldier by profession, Prebeg said he went to Kyiv in December 2019 because he wanted to help Ukraine in its eastern war against pro-Russian separatists, and later signed up to join the Ukrainian army in May 2020. His battalion was in the first line of attack when the Russian invasion – which Moscow describes as a special military operation – began on Feb. 24. Outnumbered an…