Since 1948 there was a sincere rift in the relationships between the USSR and the FPR Yugoslavia as Yugoslav leader Josip Broz Tito established a socialist regime disregarding Joseph Stalin doctrine. After Stalin's death in 1953, Tito had to choose between a more western approach to reforms or an agreement with new soviet leader Nikita Khrushchev. Tito tried to reconcile with the Soviet Union, inviting Khrushchev to Belgrade in 1955. This meeting resulted in the Belgrade declaration ending the Informbiro, granting other socialist countries the right to interpret Marxism in a different way, and ensured equal relationships amongst all satellite states and the Soviet Union. But the limits of this agreement became evident after the Soviet intervened in Hungary in October 1956; this was followed by a new Soviet campaign against Tito, which held the Yugoslavian government responsible for the Hungarian insurrection. Soviet-Yugoslav relationships went through similar cool periods in the 1960s (after the violent ending of the Prague Spring) and thereafter.