In a decision that marks a significant shift in U.S. policy, outgoing President Joe Biden has authorized Ukraine to use U.S.-made long-range missiles to strike targets within Russian territory. The move has caused divisions within his administration and comes two months before the inauguration of the president-elect, who has pledged to limit military support to Ukraine.

The Kremlin reacted strongly on Monday, accusing Biden's administration of "fueling the fire and further escalating tensions" in the conflict between Russia and Ukraine. Dmitry Peskov, spokesperson for Russian President Vladimir Putin, called the decision a "reckless and dangerous" step that increases the level of U.S. involvement in the war.

"This measure not only intensifies the conflict but also represents a qualitative shift in Washington's participation," Peskov told international media.

Meanwhile, the Russian Ministry of Foreign Affairs warned that any attack using U.S.-made missiles on its territory would be considered direct aggression from Washington, regardless of the launch originating in Ukraine. In a statement, Moscow promised an "appropriate response" if these missiles are used against Russian targets.

Although Biden's authorization has yet to be formally announced by the White House, it has already raised concerns among European allies. A German government spokesperson confirmed on Monday that Berlin was informed of the decision and is evaluating its implications for the conflict's dynamics.

The deployment of long-range missiles represents a significant escalation in Ukraine's military capabilities and could further complicate relations between Russia and the West, at a time when peace negotiations seem more distant than ever.