Indonesia gained more international support for negotiations with the Netherlands during the Geneva Summit and the Asian–African Conference in 1955, after which Dutch newspapers and churches, previously stalwartly in favour of keeping New Guinea, advocated bringing New Guinea "into a quieter sphere" of United Nations Trusteeship. Nevertheless, in 1956, the Netherlands amended its constitution to include West New Guinea as a constituent country of the Kingdom of the Netherlands, although the government excluded an amendment that would have specified self-determination as the goal of Dutch sovereignty over the territory. Inside West New Guinea, the Netherlands liberalized political parties but banned pro-Indonesia parties as subversive. In response to the Netherlands' hardening, Indonesia's position on New Guinea gradually shifted to say that the people of New Guinea already exercised their right to self-determination with the Proclamation of Indonesian Independence in 1945. After the third and final vote in the United Nations General Assembly in 1957, in which a resolution urging Dutch–Indonesian dialogue, with the support of a majority of nations representing the majority of the world's people, was blocked by the colonial powers, the Indonesian Foreign Minister Subandrio said that it would no longer seek to resolve the "West Irian" (West New Guinea) issue at the United Nations. Mass strikes and illegal seizures broke out in Indonesia against Dutch businesses in 1958, organized by the Communist Party, youths and veterans' groups which led to Dutch nationals fleeing the country. Diplomatic ties were severed with the Netherlands in 1960.