Intentional Cold War Nuclear Sabotage?

On this site there are several scenarios bandied around about nuclear weapons exploding accidentally based on real life incidents. All of these incidents caused very few deaths and generally had no impact on the Cold War. But would it have been possible for one side to intentionally sabotage a nuclear bomber on patrol in order to cause a full detonation of a nuclear weapon on the other sides own or allied territory. Such as the 1961 or 1966 crashes causing full scale detonations or a random nuclear bomber finding its payload detonating overland?
 
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