Genuine question - was he Ukranian when he went up there? I guess customs for space flight isn't such a concern, but that would be a weird thing to have go down while you're off the planet...
Actually it seems there was a changeover to a new expedition a month ago and the current commander is Japanese. I was thinking of Oleg Kotov whose nationality is Russian and was prior to this but is from Simferopol, Crimea. His Expedition 38 ended on 10 March 2014.
http://en.wikipedia.org/wiki/Oleg_Kotov