Sadly, whilst the combined European members of NATO could still inflict a lot of damage on Russia, the reality is that without the sheer military might of US back up they have insufficient leverage against Putin, even if they could muster the will power to go up against him.

I don't disagree with Trump calling out many NATO members for not properly paying their way and relying for too long on the US to make up the shortfall, nor do I disagree with criticism of those NATO countries who continue to buy Russian oil, but the US is a key ally and Trump is not acting like one.

History it may be, but the core reason why the US is the most powerful individual country in the world today is because of WW2 and the opportunities that this presented to them. The US benefitted just as much as its European allies in NATO throughout the subsequent decades of the Cold War. Surely it is not too much to ask that Trump shows more support for America's long-standing allies and their shared values rather than giving in too easily to Putin's authoritarian regime?