Czechoslovakia certainly didn’t invade in the traditional sense, because:
- The troops were there before the bolshevik revolution with the agreement of the Russian government and on the way out of Russia when they were attacked.
- Czechoslovakia didn’t exist yet.
Broadly speaking you aren’t wrong but ATM russian navy is unable to blockade even the civilian shipping of a country that has no navy. There is probably no need to resolve this issue now, especially as the Black sea countries are bound by the previous treaties on Black Sea like the Montreux convention. Moscow might be more amenable to changes of these treaties if NATO doesn’t let them win in Ukraine.