This one was crazy
15 April 1969
A United States Lockheed EC-121 Warning Star early warning aircraft was shot down by a Democratic People's Republic of Korea (DPRK, i.e. North Korea) MiG-21, killing all 31 servicemen aboard. F-4 Phantom fighter-bomber jets at Kunsan Air Base were ordered to load B61 nuclear bombs and began preparations for a nuclear strike against the DPRK.
The attack was to include the airfield from which the North Koreans had attacked the US aircraft. After a few hours, the order to stand down was given and the jets never took off. Reportedly, President Richard Nixon was drunk when he gave the order for a nuclear attack against the DPRK. The order to stand down was given on the advice of Secretary of State Henry Kissinger.
WikipediaA nuclear close call is an incident that might have led to at least one unintended nuclear detonation or explosion, but did not. These incidents typically involve a perceived imminent threat to a nuclear-armed country which could lead to retaliatory strikes against the perceived aggressor. The...
https://en.m.wikipedia.org/wiki/Nuclear_close_calls