The protests in Czechoslovakia came earlier, in 1968! The Soviets rolled in the tanks in response.

Poland had a mass solidarity movement rise up in 1980. The USSR didn't decide to send in the military then; they were lucky.

https://en.wikipedia.org/wiki/Soviet_reaction_to_the_Polish_...

There was a lot of unrest in Poland, and general strikes. Martial law was imposed.

If you were an immigrant from Czechslovakia in a refugee camp in Austria at around that time, you'd be learning to speak Polish.