Ahh yes, NATO, an alliance well known for respecting sovereignty. That's why they invade and bomb any third world nation with a sovereign project against US interests...

And how did these nations join NATO post cold war? Surely there was no manipulation of the sovereignty of Eastern European nations at that time right?

And do NATO countries have sovereignty themselves, or are they just US vassal states? Be honest here, because the answer is quite clear. It's gotten to the point that the US can bomb the gas pipelines of another NATO country (see nordstream) and nothing can be done about it. And every NATO country has to buy US weapons systems, engage in specific international training exercises, etc. Very sovereign.

Let's be clear, realpolitik is all there ever was, and all there ever will be in geopolitics. The "sovereignty" of every nation on the planet is subject to this. Unless you want to do the Turkey/Cuban missile crisis again. There's a reason Mexico can't join BRICS, there's a reason Cuba can't claim Guantanamo bay as theirs, etc.