President Nixon was able to visit Mao Zedong in 1972 because the Sino-Soviet bloc was 'no longer a bloc'.
In regime change in Indonesia 1965-66, when Suharto ousted Sukarno, Marshall Green, US ambassador in Jakarta, was deeply involved. In a Library of Congress interview three decades later, he explained how 1965-66 in Indonesia helped to 'drive a wedge' between Moscow and Beijing. He actually assisted in the horrendous death toll in the Indonesian communist party PKI - more than one million persons killed, mostly rice-farmers - to exacerbate Sino-Soviet rivalry. The role of the "Indonesian cataclysm" - as Green explained - has still not been acknowledged for its role in splitting the Sino-Soviet bloc.