Trump's pushing hard on buying Greenland, but Europe's not having it. So what's he doing? Threatening tariffs on countries that stand against him. Question is: will he actually follow through, or is this just posturing? Either way, there's a real risk here—NATO could fracture over this. And if that happens, the whole geopolitical stability piece goes sideways. UK-US relations are particularly worth watching. These kinds of trade tensions and political friction don't just impact diplomatic ties; they cascade through financial markets too. When major economies start clashing on trade, investors get nervous, and that nervousness tends to ripple across all assets.