In 1954, in a gesture of friendship to mark the 300th anniversary of Ukrainian union with Russia, Soviet Premier Nikita Khrushchev gave Crimea to Ukraine.
The 250th anniversary of Ukrainian union with Russia was in 1950.
( z1 anniversary :topic ( z2 union :ARG1 ( z3 country :name ( z4 name :op "Ukraine" ) ) :ARG2 ( z5 country :name ( z6 name :op "Russia" ) ) ) :ord ( z7 ordinal-entity :value 250 ) :time ( z8 date-entity :year 1950 ) )