Hugo Almeida put Bremen ahead after 32 minutes, but second-half goals from Ieroklis Stoltidis, Christos Patsatzoglou and Darko Kovacevic secured the Greek team's victory.
Bremen fell to 0-2 while Olympiakos now has one win and one draw.
Putin's official spokesman Dmitry Peskov commented on remarks in the US media about failures in launching nuclear-capable missiles in Russia
The Buk system that shot down MH17 belonged to the 53rd SAM missile brigade of the Russian Ministry of Defense, investigators say after looking at a few pictures on the net
It has long been understood that the West has been trying to subject Russian borders to total control. We have not seen such activity even during the Cold War