The entire Caucasus history is one of aggression. Technically, there was the brief attack on Japan at the end of WWII, too. A hundred years ago, there was also the failed naval invasion of Japan.

But you missed that the article refers to a speciality of Soviet invasions: they always used the invitation of some local communists as excuse for moves with wider motivations. (Well, all Western imperiums since Rome needed excuses: there was bringing civilisation to the barbarians, then bringing Christianity to the pagans, then civilisation again, then Enlightement, then liberty and democracy.) In 1956, it was Kádár's 'invitation', in 1968, it was an anonymous reference to a confidential letter sent by some (in truth lower-ranked) Czechoslovak party members.

_{*Lunatic*, n.
One whose delusions are out of fashion.}