<Li> December 3: India enters the Bangladesh Liberation War after India launches preemptive air strikes on Pakistani airfields . </Li> <Li> December 16: Lt. Gen A.A.K. Niazi, CO of the Pakistan Army forces located in East Pakistan surrenders unconditionally by signing the Instrument of Surrender which is accepted by Lieutenant General Jagjit Singh Aurora, joint commander of the Bangladesh - India Allied Forces . Bangladesh is officially recognized by the eastern bloc . </Li> <Ul> <Li> February 21: Nixon visits China, the first visit by a U.S. President since the establishment of the People's Republic of China . </Li> <Li> March 30: FNL goes to the offensive in South Vietnam, only to be repulsed by the South Vietnamese regime with major American air support . </Li> <Li> May 26: Strategic Arms Limitation Talks (SALT I) agreement signals the beginning of détente between the U.S. and USSR . </Li> <Li> September 1: Bobby Fischer defeats Russian Boris Spassky in a chess match in Reykjavík, Iceland, becoming the first official American chess champion (see Match of the Century). </Li> <Li> September 2--28: The Summit Series, an ice hockey tournament between Canada and Soviet Union . </Li> <Li> September 21: Philippine president Ferdinand Marcos declares martial law in response to the growing communist threat in the Philippines . </Li> <Li> December 18: Richard Nixon announces the beginning of a massive bombing campaign in North Vietnam . </Li> </Ul> <Li> February 21: Nixon visits China, the first visit by a U.S. President since the establishment of the People's Republic of China . </Li>

What were the main events of the cold war