Moscow warns that US missile authorization could mark a new level of involvement in the conflict for Washington

LONDON — Russia will consider the White House’s permission for Ukraine to use US-made longer-range weapons in Russia to be a “qualitatively new round of tensions” between Moscow and Washington, a Kremlin spokesman said on Monday.

“Allowing Kiev to strike deep inside Russia with US long-range missiles, if such permission is indeed granted, will mark a qualitatively new round of tensions and the level of Washington’s involvement in the Ukraine conflict,” said Dmitry Peskov, a Kremlin spokesman . at his daily briefing.

President Joe Biden authorized the use of the weapon, the ATACMS, or Army Tactical Missile System, in Russia’s Kursk region, two US officials told ABC News on Sunday. The missiles have a range of about 190 miles.

Ukraine had not used the weapons against Russian forces in Russia by Monday morning, a senior defense official said.

This is a development story. Please check back for updates.

ABC News’ Joe Simonetti, Lauren Minore, Shannon K. Kingston and Luis Martinez contributed to this report.