Union of Russia and Ukraine Tercentenary

The Union of Russia and Ukraine Tercentenary or the Reunification of Ukraine with Russia Tercentenary (Russian: 300-летие воссоединения Украины с Россией, 300-letiye vossoyedineniya Ukrainy s Rossiyei; Ukrainian: 300-річчя возз'єднання України з Росією) was a republic-wide celebration within the Soviet republics of Russia and Ukraine, starting in February 1954, in celebration of the union between Russia and Ukraine formed by the 1654 Pereiaslav Agreement. In preparation for the event, a special Republican commission for commemoration of the union between Russia and Ukraine Tercentenary was formed, headed by the First Secretary of the Communist Party of Ukraine Alexei Kirichenko.

Source: Wikipedia — Union of Russia and Ukraine Tercentenary (CC BY-SA 4.0)