Once again, efforts at transnational central planning failed. In December 1961, a council session approved the Basic Principles of the International Socialist Division of Labour, which talked of closer coordination of plans and of "concentrating production of similar products in one or several socialist countries." In November 1962, Soviet Premier Nikita Khrushchev followed this up with a call for "a common single planning organ." This was resisted by Czechoslovakia, Hungary, and Poland, but most emphatically by increasingly nationalistic Romania, which strongly rejected the notion that they should specialize in agriculture. In Central and Eastern Europe, only Bulgaria happily took on an assigned role (also agricultural, but in Bulgaria's case this had been the country's chosen direction even as an independent country in the 1930s). Essentially, by the time the Soviet Union was calling for tight economic integration, they no longer had the power to impose it. Despite some slow headway—integration increased in petroleum, electricity, and other technical/scientific sectors—and the 1963 founding of an International Bank for Economic Co-operation, Comecon countries all increased trade with the West relatively more than with one another.