There appeared to be an additional presence on stage with Democratic U.S. President Joe Biden and Republican former President Donald Trump in last night's CNN electoral debate: Vladimir Putin. The Russian leader was invoked roughly a dozen times in the 90-minute volley of verbal blows on domestic and foreign policy between the two candidates. Both have navigated the White House relationship with the Kremlin for a mandate each and shared very different views of the Russian leader. Trump — who has denied accusations that Moscow interfered in his favor in the 2016 election — claimed that Putin would be deterred from conflict if he respected the leadership of opposing global super