Jens Stoltenberg told reporters today "NATO will not be dragged into an arms race, but we must keep our countries safe."
The NATO chief spoke as alliance defense ministers gathered in Brussels for a meeting that is expected to increase the size of NATO's Response Force and streamline procedure for deployment of its new, ultrafast "spearhead" unit of 5,000 ground troops.
Moscow accuses NATO of threatening it by building up forces near its borders.