In 2020 Putin signed a law that on Russian territory Russian law supersedes international agreements. The actual wording nullifies international agreements that contradict the Constitution of Russian Federation, but, given that Putin can change the Russian Constitution at will, with pro forma referendum, of course, he can nullify anything he wills.
Now the question: does the rejection of the priority of international agreements over domestic law nullifies Russia's ability to demand that other countries fulfill (different) international agreements? Can Russia say "I am not bound by agreement A because it violates the Russian Constitution I just amended to contradict A, but I demand you to comply with a different agreement B?"