For the Portuguese ruling regime, the centuries-old overseas empire was a matter of national interest. The criticism against some kinds of racial discrimination in the Portuguese African territories were refuted on the grounds that all Portuguese Africans would be Westernized and assimilated in due time, through a process called civilizing mission. The wars had the same effects in Portugal as the Vietnam War in the United States, or the Afghanistan War in the Soviet Union; they were unpopular and expensive lengthy wars which were isolating Portugal's diplomacy, leading many to question the continuation of the war and, by extension, the government. Although Portugal was able to maintain some superiority in the colonies by its use of elite paratroopers and special operations troops, the foreign support to the guerrillas, including arms embargoes and other sanctions against the Portuguese, made them more manoeuvrable, allowing them to inflict losses on the Portuguese army. The international community isolated Portugal due to the long-lasting Colonial War. The situation was aggravated by the illness of Salazar, the strong man of the regime, in 1968. His replacement was one of his closest advisors, Marcelo Caetano, who tried to slowly democratize the country, but could not hide the obvious dictatorship that oppressed Portugal. Salazar died in 1970.