https://en.wikipedia.org/wiki/June_1964
June 1, 1964 (Monday). The United States and the Soviet Union signed a bilateral treaty for the first time in 30 years, allowing for the two superpowers to establish consulates in each other's cities. In addition, it was agreed that if an American citizen was arrested in the USSR, an American consular official would be notified promptly and be given access, and that the same right would …