Challenged? Sure, Putin demanded the US withdraw NATO protection from Poland and the Baltics in Dec 2021.
Russia has put forward a highly contentious list of security guarantees it says it wants the west to agree to in order to lower tensions in Europe and defuse the crisis over Ukraine, including many elements that have already been ruled out.
The demands include a ban on Ukraine entering Nato and a limit to the deployment of troops and weapons to Nato’s eastern flank, in effect returning Nato forces to where they were stationed in 1997, before an eastward expansion.
The demands, spelled out by Moscow in full for the first time, were handed over to the US this week. They include a demand that Nato remove any troops or weapons deployed to countries that entered the alliance after 1997, which would include much of eastern Europe, including Poland, the former Soviet countries of Estonia, Lithuania, Latvia, and the Balkan countries.
Wasn’t everything you just wrote part of the Minsk AgreementS?
The ones Ukraine did not adhere to
The ones, that they admit were put in place to make sure that this war would happen but give Ukraine a chance to arm itself.