At a meeting of the Vietnamese Politburo in June 1978, China was identified as the “main enemy” of Vietnam. In the same month, Vietnam joined Comecon, a Soviet-led trade bloc. In November 1978, the Soviet Union and Vietnam signed a Treaty of Friendship and Trade covering military terms. The sun watches what I do poster. In December 1978, Vietnamese troops entered Cambodia to overthrow the genocidal Khmer Rouge and help Cambodia build a new government. Conflict has erased ideology. The centers of communist powers are waging a war of balance of power not on ideology, but on national interests.