WATCH: State Department spokesperson Ned Price holds briefing amid tensions in Ukraine

The United States’ State Department says there is “no daylight” when it comes to Western allies dealing with Russia in the crisis at the Ukrainian border.

Watch Price’s remarks in the player above.

State Department spokesman Ned Price told reporters on Monday that any further Russian invasion of Ukraine would be met with “a swift, severe and united response.” “There is a there is no daylight,” he said. “We know that. And importantly, the Russian Federation knows that.”

On Monday, at U.S. President Joe Biden’s direction, the Pentagon said it was putting about 8,500 U.S.-based troops on heightened alert for potential deployment to Europe to reassure allies amid rising fears of a possible Russian military move on Ukraine.

The Pentagon’s move comes as tensions have soared between Russia and the West over concerns that Moscow is planning to invade Ukraine, with NATO outlining potential troop and ship deployments, Britain saying it would withdraw some diplomats from Kyiv, and Ireland denouncing upcoming Russian war games off its coast.

U.S. Secretary of State Antony Blinken held talks with Russian Foreign Minister Sergey Lavrov on Friday and said the U.S. would give Russia written responses to Moscow’s proposals this week, offering some hope that any invasion could be delayed for at least a few more days.

Price said he expected the written responses to be sent to Russia this week.

The U.S. has ordered the families of embassy personnel in Ukraine to leave, a move Ukraine’s Foreign Ministry spokesman, Oleg Nikolenko, said was “a premature step” and a sign of “excessive caution.” He said Russia is sowing panic among Ukrainians and foreigners in order to destabilize Ukraine.