nuclear strike on the US if Cuba were invaded, but Khrushchev was desperate to avoid nuclear war. Castro was left out of the negotiations, in which Khrushchev agreed to remove the missiles in exchange for a US commitment not to invade Cuba and an understanding that the US would remove their MRBMs from Turkey and Italy. Feeling betrayed by Khrushchev, Castro was furious and soon fell ill. Proposing a five-point plan, Castro demanded that the US end its embargo, withdraw from Guantanamo Bay Naval Base, cease supporting dissidents, and stop violating Cuban air space and territorial waters. He presented these demands to U Thant, visiting Secretary-General of the United Nations, but the US ignored them. In turn Castro refused to allow the U.N.'s inspection team into Cuba. In May 1963, Castro visited the USSR at Khrushchev's personal invitation, touring 14 cities, addressing a Red Square rally, and being awarded both the Order of Lenin and an honorary doctorate from Moscow State University. Castro returned to Cuba with new ideas; inspired by Soviet newspaper Pravda, he amalgamated Hoy and Revolución into a new daily, Granma, and oversaw large investment into Cuban sport that resulted in an increased international sporting reputation. Seeking to further consolidate control, in 1963 the government cracked down on Protestant sects in Cuba, with Castro labelling them counter-revolutionary "instruments of imperialism"; many preachers were found guilty of illegal US links and imprisoned. Measures were implemented to force perceived idle and delinquent youths to work, primarily through the introduction of mandatory military service. In September, the government temporarily permitted emigration for anyone other than males aged between 15 and 26, thereby ridding the government of thousands of critics, most of whom were from upper and middle-class backgrounds. In 1963, Castro's mother died. This was the last time his private life was reported in Cuba's press. In January 1964, Castro returned to Moscow, officially to sign a new five-year sugar trade agreement, but also to discuss the ramifications of the assassination of John F. Kennedy. Castro was deeply concerned by the assassination, believing that a far-right conspiracy was behind it but that the Cubans would be blamed. In October 1965, the Integrated Revolutionary Organizations was officially renamed the "Cuban Communist Party" and published the membership of its Central Committee. Despite Soviet misgivings, Castro continued to call for global revolution, funding militant leftists and those engaged in national liberation struggles. Cuba's