1937 dispute between Czechoslovakia and Portugal

A 1937 dispute between Czechoslovakia and Portugal over the sale of 600 machine guns led to a break in diplomatic relations between the two countries that lasted nearly 37 years.

The dispute originated with Czechoslovakia's suspicion that Portugal would attempt to transship Czechoslovak machine guns it had purchased to Spain, and Portugal's belief that Czechoslovakia's concern was due to pressure on it from the USSR.

Relations between Czechoslovakia and Portugal were reestablished in 1974 before breaking down again less than a decade later after the two countries accused one another of hostile covert activities.