"The OSCE Parliamentary Assembly: ...19. Considers that the actions by the Russian Federation in the Autonomous Republic of Crimea and the city of Sevastopol, as well as in certain areas of the Donetsk and Luhansk regions of Ukraine, constitute acts of military aggression against Ukraine; 20. Declares that the referendum held in the Autonomous Republic of Crimea and the city of Sevastopol on 16 March 2014 had no legal validity, reiterates its call on the Russian Federation to reverse its unlawful annexation of this region, and calls on participating States to refrain from any action or dealing that might be interpreted as recognizing the unlawful annexation of the Autonomous Republic of Crimea and the city of Sevastopol; 21. Expresses its grave concern over increasing militarization in the Autonomous Republic of Crimea and the city of Sevastopol and statements by some Russian officials indicating an intention to deploy nuclear weapons in that region by the Russian Federation, actions which undermine global, European, and regional peace and security..."
January 1, 1970
https://en.wikiquote.org/wiki/Annexation_of_Crimea_by_the_Russian_Federation