From Grok:

⚡️BREAKING: Russia has demanded that NATO withdraw troops and bases to the alliance’s 1997 borders as part of Ukraine peace talks.

This would require pulling forces from the 16 countries that joined after 1997:

Albania, Bulgaria, Croatia, Czechia, Estonia, Finland, Hungary, Latvia, Lithuania, Montenegro, North Macedonia, Poland, Romania, Slovakia, Slovenia, Sweden.

Per NYT reporting on a Russian non-paper circulated in Abu Dhabi talks this week, the demand revives Moscow’s 2021 proposals and is tied to ending the war in Ukraine.