Last week, French President Emmanuel Macron said that NATO was experiencing "brain death," citing a lack of coordination and America's fickleness under Donald Trump as reasons to doubt the alliance's commitment to mutual defense. NATO – the North Atlantic Treaty Organization – was formed in the wake of World War II as a counterweight against Soviet dominance in Europe and beyond. Its cornerstone is that an attack on one member is considered an attack on all. But disagreements over sharing the cost of maintaining military readiness have caused friction between the alliance's members in recent years. In 2014, the bloc agreed that each member state would increase their own defense spending to 2% of their respective GDP over the next decade. But so far, only seven of 29 members have forked out the money. Here's a look at who pays what.