In April 1969, North Korea shot down a USN reconnaissance plane. Soviet surface ships were first on the scene and contributed to a joint U.S.-USSR search-and-rescue/recovery operation—a rare example of cooperation between traditional Cold War adversaries.
Streifer, Bill and Sabitov, Irek
"“Improbable Allies”—The North Korean Downing of a U.S. Navy EC-121 and U.S.-Soviet Cooperation during the Cold War,"
Naval War College Review: Vol. 73
, Article 9.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol73/iss2/9