US ramps up Ukraine warning, says Russia may invade any day

President Joe Biden walks to board Marine One on the South Lawn of the White House, Friday, Feb. 11, 2022, in Washington to travel to Camp David, Md. (AP Photo/Manuel Balce Ceneta)

In this handout photo released by Russian Defense Ministry Press Service, British Defense Secretary Ben Wallace, right, and Russian Defense Minister Sergei Shoigu walk during their meeting in Moscow, Russia, Friday, Feb. 11, 2022. Wallace's trip came a day after British Foreign Secretary Liz Truss also held talks in Moscow. She urged Russia to pull back over 100,000 troops near Ukraine and warned that attacking would "have massive consequences and carry severe costs." Russia says it has no plans to invade but wants the West to keep Ukraine and other former Soviet countries out of NATO. (Savitskiy Vadim, Russian Defense Ministry Press Service via AP)

An Ukrainian serviceman flashes the V for victory sign during unpacking shipment of military aid delivered as part of the United States of America's security assistance to Ukraine, at the Boryspil airport, outside Kyiv, Ukraine, Friday, Feb. 11, 2022. British Prime Minister Boris Johnson said Thursday the Ukraine crisis has grown into "the most dangerous moment" for Europe in decades, while his top diplomat held icy talks with her Moscow counterpart who said the Kremlin won't accept lectures from the West. (AP Photo/Efrem Lukatsky)

US Navy fighter jets fly during the visit of NATO Secretary General Jens Stoltenberg at the Mihail Kogalniceanu airbase, near the Black Sea port city of Constanta, eastern Romania, Friday, Feb. 11, 2022. Stoltenberg paid an official visit to Romania on Friday, where he joined the country's president Klaus Iohannis at a military airbase that will host some of the 1,000 U.S. troops deployed to the country as the alliance bolsters its forces on the eastern flank as tensions soar between Russia and Ukraine. (AP Photo/Andreea Alexandru)

White House national security adviser Jake Sullivan gives an update about Ukraine during a press briefing at the White House, Friday, Feb. 11, 2022, in Washington. (AP Photo/Manuel Balce Ceneta)

President Joe Biden gives a thumbs up as he walks to board Marine One on the South Lawn of the White House, Friday, in Washington to travel to Camp David, Md. (AP Photo/Manuel Balce Ceneta)

WASHINGTON — The Biden administration on Friday escalated dire warnings of a possibly imminent Russian invasion of Ukraine, saying it could happen at any moment, even as emergency diplomatic efforts continued. Adding to the sense of crisis, the Pentagon ordered an additional 3,000 U.S. troops to Poland to reassure allies.