A group of B-52 bombers allegedly approached Russia's border but then changed course when Russian jets came closer.
The World’s Fastest Propeller Aircraft
The Russian Tu-95MC strategic bomber is the world’s fastest turboprop aircraft. These are the Russian planes reported to have flown into US air space near California in recent news. Source: http://www.reuters.com/article/2014/05/06/us-usa-russia-asiapac-idUSBREA4501M20140506