According to Soviet Marxist–Leninist theorists, the basic character of Soviet foreign policy was set forth in Vladimir Lenin's "Decree on Peace", adopted by the Second Congress of Soviets in November 1917. It set forth the dual nature of Soviet foreign policy, which encompasses both proletarian internationalism and peaceful coexistence. On the one hand, proletarian internationalism refers to the common cause of the working class (or the proletariat) of all countries in struggling to overthrow the bourgeoisie and to start a communist revolution. Peaceful coexistence, on the other hand, refers to measures to ensure relatively peaceful government-to-government relations with capitalist states. Both policies can be pursued simultaneously: "Peaceful coexistence does not rule out but presupposes determined opposition to imperialist aggression and support for peoples defending their revolutionary gains or fighting foreign oppression."