The Defense Department has withheld approval for attacks as the White House has sought to entice Moscow to open peace talks.

Kyiv had long requested permission to use U.S. weapons to launch strikes deep into Russia before the Biden administration gave the go-ahead.

The Pentagon has been quietly blocking Ukraine from using U.S.-made long-range Army Tactical Missile Systems (ATACMS) to strike targets inside Russia, limiting Kyiv's ability to employ these weapons in its defense against Moscow's invasion,

Vice President JD Vance said Sunday that Russia has made "significant concessions" in talks to end its war with Ukraine but didn't rule out imposing more sanctions to pressure the Kremlin toward peace.