In connection with the events in Czechoslovakia the question of the relationship and interconnection between the socialist countries' national interests and their internationalist obligations has assumed particular urgency and sharpness. The measures taken jointly by the Soviet Union and other socialist countries to defend the social gains of the Czechoslovak people are of enormous significance for strengthening the socialist commonwealth, which is the main achievement of the international working class. The Marxist dialectic opposes one-sidedness; it requires that every phenomenon be examined in terms of both its specific nature and its overall connection with other phenomena and processes. World socialism as a social system is the common achievement of the working people of all countries, it is indivisible, and its defense is the common cause of all Communists and all progressive people on earth, first and foremost the working people of the socialist countries.