What is the greater threat to America?

[America Needs R'hllor]

On a large scale, definitely Russia. The Islamic Terrorism is a serious problem and every life lost to them is a tragedy, but they don't have nukes and aren't nearly as likely to seriously threaten democratic U.S. allies (Israel will never forget succumb, but the Baltic states and Finland for example are very much threatened).

[America Needs R'hllor]

Islamic terrorism. Putin doesn't kill American citizens at home.

Putin would watch millions die and never blink. The terrorists would too, sure, but he's actually capable of doing it.