Trump threatens Iran as huge protests turn violent, says U.S. is "locked and loaded" 
A Russian fighter jet has collided with a US drone, causing the unmanned US aircraft to crash into the Black Sea, the US military says.
It says the drone was on a routine mission in international airspace when two Russian jets tried to intercept it.
Russia said the drone crashed after a “sharp manoeuvre”, and denied that the two aircraft made contact.
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