WATCH: Pentagon says Defense Secretary Austin is meeting with NATO in Brussels to discuss Ukraine

The Pentagon announced that Defense Secretary Lloyd Austin will go to the NATO defense ministerial in Brussels this week, and will also visit Poland and Lithuania, neighbors to Ukraine.

Watch the event in the player above.

Pentagon press secretary John Kirby said Austin will meet with the presidents, defense ministers and other key leaders in Poland and Lithuania, as well as U.S. forces in those countries.

Kirby said Austin also is planning to have a trilateral meeting with the defense chiefs of the three Baltic nations, Lithuania, Latvia and Estonia.

Diplomatic efforts to head off what U.S. officials have warned could be an imminent Russian attack on Ukraine entered a new round on Monday. Russia’s top diplomat advised President Vladimir Putin to continue talks and Germany’s chancellor met the Ukrainian president.

Nonetheless the U.S. announced it is closing its embassy in Ukraine and moving all remaining staffers there to a city near the Polish border.

Earlier, Britain’s prime minister said Europe is β€œon the edge of a precipice,” citing an American warning that Russia could invade Ukraine in the next 48 hours.