The U.S. Embassy warns that Russia may launch a massive attack on Ukraine on November 20.

The U.S. Embassy in Ukraine has received "specific" information regarding a potential large-scale Russian strike on Ukraine, which may occur on November 20. This was reported on the diplomatic mission's website.

The embassy will be closed, and its staff will receive instructions for possible sheltering on-site. The embassy advises U.S. citizens to be prepared to find shelter immediately in the event of an air raid alert.

They also urge their citizens to stay updated with news from Ukrainian media, identify a shelter in advance, and follow the guidance of Ukrainian authorities in case of an emergency.

No details about a possible Russian attack were provided.