Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Russia has paid tribute to a former Soviet intelligence officer it credits with uncovering a Nazi plot to kill the Allied leaders Churchill, Stalin and Roosevelt during World War Two.

Goar Vartanyan: Russian spy who 'changed history' dies at 93