WH national security adviser says there's a 'very distinct' possibility of Russian attack on Ukraine

As the standoff between Russia and the United States continues, White House National Security Adviser Jake Sullivan joins ABC's "This Week."

As the standoff between Russia and the United States continues, White House National Security Adviser Jake Sullivan warned of a "very distinct" possibility Russia will attack Ukraine at "any time now."

"We believe that there is a very distinct possibility that Vladimir Putin will order an attack on Ukraine. It could take a number of different forms. It could happen as soon as tomorrow or it could take some weeks yet," Sullivan said in an interview with ABC "This Week" Co-Anchor Martha Raddatz on Sunday.

"[Putin] has put himself in a position with military deployments, to be able to act aggressively against Ukraine at any time now," he added, stressing that the United State is working with allies and continues to urge a path of diplomacy.

Sullivan said the United States is ready to respond, no matter what Russia decides.