Since Russia's annexation of Crimea in 2014, relations between NATO and Russia appear to have reached an all-time low.
Al Jazeera: Is Russia really a threat to the Baltic states?
A Russian Il-78 aerial refueling tanker (top) and Russian Su-34 fighter bombers fly above Moscow's Red Square, on May 7, 2015, during a rehearsal for the Victory Day military parade.
