WASHINGTON (REUTERS) - Tensions between the United States and Russia will not "spiral out of control" following last week's US cruise missile strike on a Syrian air base, US Defence Secretary Jim Mattis said on Tuesday (April 11), describing the strike as one-off to deter Syria's use of chemical weapons.

"I'm confident the Russians will act in their own best interest and there is nothing in their best interest to say they want this situation to go out of control," Mattis told a news briefing.

(This is a developing story)