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I've just been watching an odd Cold War/WWII kind of crossover movie called Ghostboat staring David Jason of A Touch of Frost fame (click link here for brief plot details).
It's a somewhat silly movie, but what got me thinking, was, what if during the worst years of the Cold War, say early 1980s, someone actually attacked a Soviet naval base in the Baltic causing deaths & damage, but whatever evidence collected was inconclusive as to who did it.
So how do the Soviets react to such an unprovoked & unexpected attack with no one to blame for the attack?