Conceivably you could have this by getting the 1957 Anti-Party coup against Khrushchev to succeed. With a Stalinist (probably first Bulganin, then Molotov) at the helm of the USSR, the Sino-Soviet split is avoided. The KGB embarks on a sustained campaign of subversion and intrigue that slowly drags India and Pakistan into the Soviet orbit, while Burma succumbs to a leftist military coup d'etat and aligns itself with the Communist cause. Afghanistan is invaded to complete the puzzle.
That however is quite an implausible scenario. The pattern generally went that if a nation succumbed to Communism, its surrounding environs would end up immeasurably strengthened against contagion by the US. With North Vietnam growing dominant in Indochina by 1975, Thailand was strengthened; by the time the Iron Curtain was raised, the US was thinking about forming NATO; when it looked like India was leaning too close to the Soviet Union, Washington 'tilted' toward Pakistan.