Knight Without Armour(1937)

In the last days of Czarist Russia, Russian-speaking Briton A.J. Fothergill is enlisted by his government to go undercover as Bolshevik radical Peter Ouranoff in an attempt to gain access to the revolutionaries' inner circle. Tasked with accompanying lovely aristocrat Alexandra Vladinoff from Moscow to Petrograd to be tried for crimes against the proletariat, Peter attempts to spirit her out of the war-torn country.