By Aleksandar Vasovic KYIV (Reuters) – When Russia invaded Ukraine last week, Max Karmazin said he and his friends fled Kyiv to the relative safety of the west of the country. The Ukrainian has since changed his mind, and, after spending Sunday night with thousands of others in the city’s metro system, where they have been sheltering from possible missile strikes, he plans to volunteer to fight in the war. Russian forces far outnumber Ukraine’s, but they have met with fierce resistance particularly in and around cities. Civilians have joined up with local defence forces to support troops in th…