Final answer:
Nixon's approach to China and the USSR was characterized by détente, a strategy of easing tensions with these nations individually, leading to improved relations and accords like SALT that aimed to control nuclear proliferation.
Step-by-step explanation:
The difference in President Nixon's approach to China and the USSR was characterized by détente, a policy aimed at easing tensions and promoting peaceful coexistence. The Nixon administration sought to exploit the Sino-Soviet split and foster improved relations with both countries individually, in contrast to prior policies that were more confrontational. Nixon's historical 1972 visit to China marked the resumption of diplomatic relations after decades of isolation and was part of covert efforts orchestrated by National Security Advisor Henry Kissinger. This diplomatic breakthrough pressured the USSR into adopting a similar stance of reduced hostilities, culminating in the signing of the Strategic Arms Limitation Treaty (SALT) and other agreements aimed at controlling nuclear proliferation and enhancing bilateral cooperation.