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Perestroïka combines domestic reform with a new international "thinking" rooted in both socialist and social-democratic experiments, and turned against the logic of "blocks". Being now in the nuclear era, mankind is no longer immortal. Class-struggle principles are still relevant but submitted to principles common to the whole of mankind. A critical view of the Brejnevian imperialism and of the illusions of the "general crisis of capitalism". Marxism reinvigorated by Gramsci's approach.