Trump has already imposed 50% tariffs, causing major economic losses. NATO has already threatened to impose 100% tariffs on us if we keep buying russian oil. And these are mere tariffs, not actual sanctions.
Maybe we're looking at vastly different numbers, but most analysts are expecting little to no impact from the 50% tariffs. The US only makes up 12% of our exports, and they've already cut down the scope so that only around 36% of those are even affected. Since we mostly export commodities, even those 36% can just be sold elsewhere.
The NATO claims are irrelevant: NATO is not a trade alliance and the US struggles to get it to comply even with its intended military goals. You can safely place the odds of the other NATO countries agreeing to their own tariffs at approximately 0%.
Sovereignty must be backed up by military and economic power. We have neither. It's complete fantasy.
Not sure where you get this idea? We have both military and economic power. Just because we're not as large as the US or China doesn't mean we have nothing.
Also, I don't see why you think there's a possibility of this escalating to war. Trump already had to back down with large exceptions to his 50% tariffs due to the domestic political impact it would have, and war is extremely unpopular with the Americans these days, which is why they only fund Ukraine and Israel instead of actually sending soldiers to fight.