Mikhail Gorbachev has died

Gorbachev secured his place in history by what he didn't do. While never endorsing the end of the eastern bloc, he made it clear beginning in the late 1980's that unlike his predecessors, he would not oppose democratic reforms in Eastern Europe by force. To general astonishment, he kept this promise, and with the regrettable exception of Lithuania this commitment to not repeating the crimes of his predecessors is Gorbachev's greatest legacy. In 1988 you would have been hard pressed to find anyone who could imagine the mostly peaceful collapse of the Eastern Bloc, but Gorbachev had the moral courage to accept this once unimaginable consequence of his policy and to see it through.

Not to pick a fight, but I feel it's important then to note that it was not Reagan who "won" the Cold War. It was Gorbachev, who had the political courage (and idealism) to take the leap.

I thought it was Reagan who forced Gorbachev and the Soviet Union into this position by arms racing them to death. I bet you Gorbachev would try to keep the empire if it wasn't for the economical collapse. He sent tanks to the Baltics. He cheered for the annexation of Crimea. His empire might've been more democratic than the USSR used to be, but still an empire. Also, he was a communist and tried to keep it, but the people were full of communism.

Gorbatchev could still have sent the tanks to suppress the peaceful protests like his predecessors did in the 50's and 60's (or China did at this very point in history, and this is exactly what would have happened under a different Soviet leader). Even if this was the only thing Gorbatchev did right in his entire life, it was this one decision that deserves to be his legacy.

No, he couldn't - there wasn't enough anything to do an operation like that, thanks to the economic pressure of the previous arms race. People were rebelling. Also, people remembered that they weren't exactly welcome in 1968. At this point the satellite states had much stronger economies than the USSR and could've effectively protected themselves (and there were very serious plans to do so).

Look at Ukraine today - they are using so much Western technology, relying on so much Western money - and yet they can't get 500 km past Ukraine border. They wouldn't reach their own border if they had only their own resources.

I don't know how it was in the rest of Eastern Europe, but for instance the East German government was much more 'conservative' than Gorbatchev and heavily opposed to perestroika/glasnost. If Gorbatchev wouldn't have left Honecker hanging dry, Honecker would have welcomed the Soviet tanks against his own people.

You don't need to be able to compete with the US military technology to kill unarmed protesters. T-54s will do just fine.

The thing is, the tanks would have to get there. Getting a tank 1000 km past at least 3 unfriendly borders is an enormous logistics issue, and a major resource drain - resources that simply did not exist, not even talking about the human resources.

And you're discounting the strength of millions of super-angry people too much. They would destroy the few tanks with rocks (or molotovs, as illustrated in Ukraine) if they had to.