I believe part of joining NATO was settling those claims and giving up on retaking that territory by force.

Aka “Windows subsystem for Linux”

There is absolutely nothing wrong with NATO sharing a border with Russia. NATO is a defense pact. It won’t invade Russia to “stabilise” or for anything else. It’s all right there in the NATO charter.

In fact NATO has shared a border with the Russian exclave of Kaliningrad for decades. And there haven’t been any problems. More recently, NATO member Finland has a land border of many hundreds of kilometers with Russia’s mainland territory. That doesn’t seem to be hurting anyone or anything, except perhaps Mr. Putin’s ambitions to one day reconquer Finland.

Edit: I forgot the Baltics! How could I forget NATO members Estonia, Latvia, and Lithuania (since 2004)?