WASHINGTON – President Joe Biden’sJake Sullivan, the national security adviser gave a dire description on Sunday of what a Russian invasion would look like. He urged Americans leave Ukraine immediately.

“If Russia invades Ukraine militarily, it will likely start with a barrage of missiles or bomb attacks,” Sullivan stated on CNN’s “State of the Union”.

“It would then follow an onslaught by a ground force moving through the Ukrainian frontier,” said he, noting that many civilians would get caught up in the melee.

Sullivan stated that the Kremlin’s extraordinary military buildup at Ukraine’s borders has been intensified in the last 10 days. According to Sullivan, Russia’s existing force structure in the region could allow it “to launch a military operation very quickly.”

Over the past months, U.S. allies and their Western counterparts have been seeing a steadily increasing number of Kremlin soldiers along Ukraine’s border with Russia or Belarus. Russia has been mimicking Russia’s tactics since its illegal annexation, in 2014, of Crimea. This was a small peninsula located on the Black Sea. It sparked international protests and brought about sanctions.

Biden will be speaking with Volodymyr Zeleskyy, Ukrainian President on Sunday while he is in Camp David. Following Biden’s Saturday phone call with Russian President, the call is scheduled for Sunday. Vladimir Putin.

Biden’s name was confirmed by the White House conversation with Putin’s first speech was at 11:04 am ET. ET, and the conversation lasted approximately an hour.

Russian counterpart Biden was warned that Washington would impose severe and rapid costs if Ukraine were to invade again. Biden indicated that, while diplomacy is an option for the U.S., it was equally capable of handling other situations.

In a warning issued last month by the Pentagon’s top officers, they warned that aftermath of a Russian invasion of Ukraine would be “horrific.”

The type of forces arrayed means that the ground maneuver forces and artillery are combined with the missiles and air force to form a package. It would have a very serious impact on Ukraine and would cause a lot of deaths,” U.S. Army General Mark Milley, Chairman of the Joint Chiefs of Staff, told reporters on January 28.

Milley added, “It’d be terrible.”

Milley was the highest ranking military officer in the country and said that Russia’s position along Ukraine’s borders was different from anything else he had seen over his four decades of military service.

Lloyd Austin, Secretary of Defense was able to order U.S. soldiers who were deployed in Ukraine last year to be evacuated and to reposition themselves elsewhere in Europe.

160 National Guard soldiers from Florida were deployed to Ukraine by the 53rd Infantry Brigade Combat Team in November.

“The Secretary made this decision out of an abundance of caution — with the safety and security of our personnel foremost in mind — and informed by the State Department’s guidance on U.S. personnel in Ukraine,” Pentagon spokesman John Kirby wrote in a statement.

He said that although this repositioning doesn’t change our resolve to support Ukraine Armed Forces but it will allow us flexibility in assuring allies, and deterring aggressive behavior.

On Saturday, however, the State Department stated that it will reduce the U.S. Embassy’s staff in Kyiv by a minimum of diplomats.