begins relocating staffers out of the ukrainian capital. president biden tonight, and president putin unable to reach agreement after their weekend phone call. yet some paths of diplomacy remain open tonight. the white house sticking with imprenows characterizations saying the window for improvisation is open and that it could happen at any time many ukrainians including their president offering a brave front as the u.s. believes 100,000 russian troops menace from several directions across its border. our richard engle is there. >> reporter: with diplomacy going anywhere, this is not a good sign. russian troops in belarus practicing you are ban combat. u.s. officials say this week is critical, declaring russia is now able to attack with little or no warning. so the u.s. is now moving its embassy personnel out of the capital to western ukraine, a move criticized by