NATO allies are expected to be asked to pump up their defense spending when the organization's Secretary General Mark Rutte speaks in London Monday.

The head of NATO plans to say the military alliance needs to increase its air and missile defenses by 400% to counter the threat from Russia.

Washington’s European allies must make a “quantum leap” in military spending to deter Russia, the head of NATO is expected to say Monday, calling for a 400% increase in the continent’s air and missile defense budget.