No, the first notice we had was their successful 1949 test. We were just beginning to setup surveillance systems at that time, in expectation that they would eventually develop nuclear weapons, but did not expect to see positive results on what was an early practice sampling flight.
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The U.S. is first to have nuclear weapons, having nukes since 1945. The Soviet Union followed the U.S. by developing and testing their first nuke in 1949. Both nation started making hydrogen bombs (nukes using nuclear fission to explode) starting in the mid-1950s. Excuse me replying with a question, but were the Atomic bombs dropped on Japan in 1945 Nuclear weapons ? I am assuming they were, but do not know of the differentiation.
Difficult to know. We're still here, the Soviet Union collapsed under its own weight, and there was no nuclear World War III. So obviously, we didn't mess it up TOO badly. Certainly, we could have done far worse than we did, and we can all point to a myriad of mistakes along the way. But there was no nuclear war, and that counts for a LOT.
i know 6 SS-4 Nuclear missiles
We won't know that for several years, if ever.
The closest we came to a nuclear confrontation with Russia that I know of, was under John F. Kennedy during the Cuban Blockade in 1962.