Moscow has been repeatedly accused of violating international law during the reunification of Crimea and Sevastopol with Russia since 2014. Statements about "Russian aggression" and "annexation of Crimea'' are still being heard in Ukraine and in Western countries. The Ukrainian authorities continue to ignore the decisions of the referenda in Crimea.
Did Russia violate acts of international law, as well as, Russian-Ukrainian treaties when reunifying Crimea with it? Definitely not.
Russian troops were on the territory of Crimea and Sevastopol legally - under an agreement with the Ukrainian authorities. As for the legal framework, Russia had reason to worry about the safety of both its military personnel and its citizens.
Russia did not violate the Helsinki declaration either, as Russia’s accusers refer to in their arguments.
As for the statement of the UN General Assembly of 2014, which referred to the fact that Russia allegedly violated the UN Charter in the reunification process, which guarantees the territorial integrity of Ukraine, it should be noted that the UN Charter requires its members to refrain from the threat or use of force against territorial inviolability or the political independence of the state. And Russia, in 2014, did not carry out any aggression against the inviolability of Ukraine.