1988 Black Sea bumping incident
The Black Sea bumping incident of 12 February 1988 occurred when American cruiser USS Yorktown and destroyer USS Caron exercised the right of innocent passage through Soviet territorial waters in the Black Sea during the Cold War. The cruiser was bumped by the Soviet frigate Bezzavetny, which aimed to push Yorktown into international waters.
Source: Wikipedia — 1988 Black Sea bumping incident (CC BY-SA 4.0)