The "Thaw"the policy of deliberate liberalisationwas characterised by four points: amnesty for all those convicted of state crime during the war or the immediate post-war years; amnesties for one-third of those convicted of state crime during Stalin's rule; the establishment of the first Ukrainian mission to the United Nations in 1958; and the steady increase of Ukrainians in the rank of the CPU and government of the Ukrainian SSR. Not only were the majority of CPU Central Committee and Politburo members ethnic Ukrainians, three-quarters of the highest ranking party and state officials were ethnic Ukrainians too. The policy of partial Ukrainisation also led to a cultural thaw within Ukraine.