Tonton Streaming Mission: Impossible (1966) S1E14 - The Short Tail Spy

A defector has been targeted by two rival groups from the same foreign country. The team is to discredit the younger group, so that the U.S. can more easily handle the old-line group. The IMF sets it up so that the younger group's assassin, Fetyukov, must seduce Cinnamon to get to the defector. The two play a dangerous romantic game, while Dan convinces the older group's assassin, Shtemenko, that Fetyukov betrayed him to the Americans. They then get pictures of him trying to assassinate the defector, and try to blackmail him to convince him further that Fetyukov is responsible. Cinnamon ""saves"" Fetyukov and convinces him that she wants to defect. As Fetyukov goes after the defector, it's up to Cinnamon to stop him.