Cold War political demarcation between the Communist states of East Asia (USSR, PRC, North Vietnam, Laos, North Korea, Khmer Rouge etc.) and the non-Communist states (India, Myanmar, Japan, Taiwan, South Korea, South Vietnam, Philippines etc.)
The Bamboo Curtain in 1959. The Curtain itself is in black. Note that at the time, Laos was allied with the United States, as the Communist Pathet Lao did not take over the country until 1975. Also, North and South Vietnam had not yet been united. The boundaries of the now-independent former Soviet republics are anachronistically shown for context.