Negotiations between the United States and North Korea have proceeded in fits and starts for decades. But they have failed to halt the advance of North Korea’s nuclear and missile programs.

The nuclear arms race was perhaps the most alarming feature of the Cold War competition between the United States and Soviet Union. Over the decades, the two sides signed various arms control agreeme…

Since India’s independence, ties with the United States have weathered Cold War–era distrust and estrangement over India’s nuclear program. Relations have warmed in recent years and cooperation has strengthened across a range of economic and political areas.

Since Fidel Castro’s ascent to power in 1959, U.S.-Cuba ties have endured a nuclear crisis, a long U.S. economic embargo, and political hostilities. The diplomatic relationship remained frozen well b…