Just in the last few years, looking at the deliberate efforts of cutting off all diplomatic relations with Russia. Banning and smearing all foreign opposition media. Assassination of diplomats. Rampant militarized racism. Trade wars. Mass sanctioning and coups of any nation who opposes US war interests. Endlessly blocking UN efforts. Endlessly blocking hostage negotiations. Constant escalations... It really establishes that the US and it's allies have completely lost interest in any form of diplomacy and seem to be preemptively closing those exits just to keep any form of diplomatic resolution off the table, thus ensuring a hot world war to keep the military economy running.