KHRUSHCHEV’S PREMIERSHIP: Paris, 29 – The first explanations were offered today for the replacement of Nikolai Bulganin as prime minister of the Soviet Union by Nikita Khrushchev. According to the Moscow correspondent of Agence France-Presse, and as confirmed by foreign communist sources, the replacement of Bulganin was not in the nature of a purge, as some Western commentators had hinted. In fact, as negotiations with the West on major international issues were about to begin at the level of heads of government, it was only natural that Khrushchev should attend both as prime minister and as first secretary of the Soviet Communist Party. Russian newspapers today published articles welcoming Khrushchev’s appointment. The Moscow News published a photograph of Khrushchev at his desk in the Kremlin. Pravda wrote that the Supreme Soviet’s decision to appoint Khrushchev had the unanimous approval of the entire Soviet people as well as «our friends abroad.» BOLSHOI: It has been announced that the government will not issue permits for the Bolshoi Ballet or the American Negro Ballet to visit Greece during the election campaign for fear of incidents that might harm the friendly relations between Greece and the Soviet Union.