In the 1950s, China and the Soviet Union were allied against the US. After US President Richard Nixon’s opening to China in l972, the balance shifted, with the US and China cooperating to limit what they viewed as a dangerous rise in the Soviet Union’s power.
也许更有道理的是，这一合作关系有历史先例。20世纪50年代，中国和苏联就结盟对付美国。1972年，美国总统尼克松叩开了中国的大门，此后这一平衡就发生了变化，美国和中国联手限制它们认为十分危险的苏联实力的崛起。