The UK pays in more to defence than any other member of NATO outside of the USA.

By further increasing our spending to 3%, almost a match to the USA, we solidify our commitment to NATO, showing America that we support the President's call and are the USA's true friend and ally in this matter.

We will show other large NATO nations that they must do more to help the defence of the alliance.

http://www.nato.int/nato_static_fl2014/assets/pdf/pdf_2016_01/20160129_160128-pr-2016-11-eng.pdf