@Joshua Ochoa: It's 2% of their GDP that they must spend on defense, not 20%. Nations must then spend 20% of that 2% figure on heavy equipment (tanks, jets, etc.) which really isn't much at all considering what 20% of 2% of the GDP of some of the nations amounts to. It is imperative that nations pay the 2% required of them, if not for the sole reason that they made a commitment and must follow through on it in order to reap the benefits the alliance provides. I'm not advocating wall-building, isolationism, or any other Trump-isms, I simply feel that it's not fair for some countries to make their full contributions while others do not and still receive the same benefits as those that do. And yes, NATO is still very much necessary- among other reasons, it serves as a deterrent to Russian aggression again nations like Estonia (which meets its NATO commitments each year).