"t-they dont mean it! so that means they can continue throwing threats and testing nuclear bombs that land on another nations boundaries without zero repurcussions!"
There's a method to taking military action, and it doesn't always mean "kill them before they kill us"
there are certain steps that a country should take before they go all out and start destroying whole cities
same logic that let national socialist germany trample over europe, nobody wanted to interfere until it was too late and poland was invaded
Germany declared war. In that case, it's completely justified to mount an invasion or offensive of some sort. In this case, there's no war in effect. It's just threats and a few treaty violations. There are proper ways to handle those things that dont involve violence