Доверяй, но проверяй - Doveryay, no proveryay

Trust, but verify (Russian: Доверяй, но проверяй, tr. Doveryay, no proveryay, IPA: [dəvʲɪˈrʲæj no prəvʲɪˈrʲæj]) is a rhyming Russian proverb. The phrase became internationally known in English after Suzanne Massie, an American scholar, taught it to Ronald Reagan, then president of the United States, the latter of whom used it on several occasions in the context of nuclear disarmament discussions with the Soviet Union. It's since been adapted by Bitcoiners to "Don't trust, verify."