As an example:
As National Security Advisor under Nixon, Kissinger pioneered the policy of détente with the Soviet Union, seeking a relaxation in tensions between the two superpowers. As a part of this strategy, he negotiated the Strategic Arms Limitation Talks (culminating in the SALT I treaty) and the Anti-Ballistic Missile Treaty with Leonid Brezhnev, General Secretary of the Soviet Communist Party
Kissinger sought to place diplomatic pressure on the Soviet Union. This paved the way for the groundbreaking 1972 summit between Nixon, Zhou, and Communist Party of China Chairman Mao Zedong, as well as the formalization of relations between the two countries, ending 23 years of diplomatic isolation and mutual hostility. The result was the formation of a tacit strategic anti-Soviet alliance between China and the United States.