What was the proposed Nixon-Doctrine?

The Nixon Doctrine was put forth during a press conference in Guam on July 25, 1969 by US President Richard Nixon and later formalized in his speech on Vietnamization on November 3, 1969. According to Gregg Brazinsky, Nixon stated that "the United States would assist in the defense and developments of allies and friends", but would not "undertake all the defense of the free nations of the world." This doctrine meant that each ally nation was in charge of its own security in general, but the United States would act as a nuclear umbrella when requested. The Doctrine argued for the pursuit of peace through a partnership with American allies. The Nixon Doctrine implied the intentions of Nixon shifting the direction on international policies in Asia, especially aiming for "Vietnamization of the Vietnam War."