Russia Opens Criminal Case Against Ukrainian Military Commanders
http://www.rferl.org/a/28143416.html

Interesting is that Russia somehow thinks it has judicial control over Ukraine...will then Ukraine open criminal investigations of Lavrov and Putin the General of the Russian General Staff

BUT WAIT...Russia quit the ICC after the ICC stated that yes Russia had committed war crimes in Crimea and by extension eastern Ukraine...

So in theory Ukraine could bring war crimes charges against Putin in the ICC as Ukraine is a member of ICC by treaty.