Kiev - Ten Communist rowboats blocked the exit of a squadron of NATO warships from a Ukrainian harbour, Channel 5 television reported Monday.
Demonstrators manning the craft had set up a patrol line in Odessa bay between the vessels and the open Black Sea, preventing NATO combat vessels from departing to participate in the US-led Sea Breeze 2008 international naval exercise.
Port officials had taken three boats into custody by mid-morning, but the blockade was continuing as Ukrainian police attempted to convince the protestors to move out of the way.
The anti-NATO activists were members of three extreme left-wing groups opposed to Ukrainian cooperation with the Western alliance.