There was no formal treaty forbidding NATO's eastward expansion to Russia's border, and claims that President Biden 'broke' such a treaty are not supported by credible evidence; NATO expansion has been a complex, contested issue but not legally prohibited by treaty.
I’m not defending Russia but we did sign a treaty with them. A treaty that forbids NATO to expand east to its border. Biden broke it and now Ukraine’s in shambles.

‘There was no promise not to enlarge NATO’ - Harvard Law School
Source: hls.harvard.edu
Key Evidence
Harvard Law School states there was no promise not to enlarge NATO.
hls.harvard.eduhls.harvard.edu‘There was no promise not to enlarge NATO’
PolitiFact fact-checked and found no evidence of a treaty forbidding NATO expansion.
politifact.compolitifact.comPolitiFact
NATO and Western sources describe Russia's claims as disinformation used to justify its invasion of Ukraine.
france24.comfrance24.comDid NATO ‘betray’ Russia by expanding to the East?
nato.intnato.intDe-bunking Russian disinformation on NATO
What the Evidence Shows
The claim that the U.S. And NATO signed a treaty forbidding NATO from expanding eastward to Russia's border is not supported by historical or legal evidence. Multiple authoritative sources, including Harvard Law School and PolitiFact, confirm that no such formal promise or treaty exists.hls.harvard.eduhls.harvard.edu‘There was no promise not to enlarge NATO’
politifact.compolitifact.comPolitiFact
Discussions at the end of the Cold War involved informal assurances about NATO's non-expansion, but these were not codified in any binding agreement. Russia's narrative that NATO expansion violated a treaty is widely regarded as part of a disinformation campaign to justify its aggressive actions against Ukraine.france24.comfrance24.comDid NATO ‘betray’ Russia by expanding to the East? Mikhail Gorbachev himself noted that NATO expansion was not formally discussed during Soviet-era negotiations.
rferl.orgrferl.orgDid The West Promise Moscow That NATO Would Not Expand? Well, It's Complicated+2 more
Regarding President Biden, there is no evidence he 'broke' any treaty related to NATO expansion. While some analysts and officials have acknowledged that the U.S. And NATO did not fully address Ukraine's potential membership before the Russian invasion, this reflects diplomatic choices rather than treaty violations.responsiblestatecraft.orgresponsiblestatecraft.orgBiden official admits US refused to address Ukraine and NATO before Russian...
Ukraine's current situation is the result of multiple factors including Russia's military aggression, not simply NATO policies or alleged treaty breaches.nato.intnato.intTopic: NATO's response to Russia's invasion of Ukraine
atlanticcouncil.orgatlanticcouncil.orgThe real reason Russia invaded Ukraine (hint: it's not NATO expansion) The complexity of NATO enlargement involves geopolitical strategy and security concerns rather than straightforward legal prohibitions.