decision to travel to the u.n. late tuesday night. a surprise and high-stakes move on the biggest international stage. >> russian missiles and bombs will drop across ukraine. russian soldiers will advance on key targets that have already been identified and mapped out in detailed plans. >> reporter: and force their hand in what may be a last-ditch effort to salvage a diplomatic path. >> today we are laying it out in great detail, with a hope that by sharing what we know with the world, we can influence russia to abandon the path of war and choose a different path while there's still time. >> reporter: just hours after defense secretary lloyd austin in brussels to meet with nato allies listed his own ominous warning. >> we even see them stocking up their blood supplies. >> reporter: vice president kamala harris set to land in munich for her own high-stakes diplomatic engagements, all as russia after weeks of silence delivered its response to u.s. security proposals meant to