“A Ukraine that is part of NATO can be considered threatening to Russia”
Threatening or a threat?
And you have lots of what ifs. The strangest part is that, as you may know Russia annexed Crimea. So your argument, that if Ukraine joins NATO then if Russia takes Crimea, is at best questionable.
Your historical analysis, while interesting is a bit irrelevant too. As you know European borders changed dozens of times over the past centuries. Things change. all of Ukraine was part of Russia, as was Poland for that matter . I think it was you who first shared with me the “I was born in Austro-Hungary, bar mitzvahd in Czechoslovakia, married in Hungary, had my first child in the USSR, and died in Ukraine, without ever leaving Munkatch” in 1954 Crimea became part of Ukraine. Shoin! fertig Mazel Tov