Add Yahoo as a preferred source to see more of our stories on Google. Ukrainian troops ride atop an armoured vehicle in Ukraine's Sumy region as they advance towards the Russian border - AP Ukrainian ...

Russian President Vladimir Putin's military forces have been building a network of trenches throughout Ukraine, but these lines may not be completely effective. "Troops are basically sitting ducks, ...

With Ukrainian leaders vowing to retake all of their territory occupied by Russia, Moscow has readied elaborate defenses, especially in Crimea, the peninsula it annexed illegally in 2014, which is now ...