Vladimir Putin has warned that allowing U.S. weapons to strike inside Russia would make the United States a direct party to the conflict.

ATACMS Get a Green Light. On Sunday, U.S. President Joe Biden authorized Ukraine to use the U.S. Army Tactical Missile System (known as ATACMS) for limited strikes inside Russia.

For the first time, President Joe Biden has authorized Ukraine to launch American-supplied missiles deep inside Russian territory, according to multiple news reports. The missiles are known as Army Tactical Missile Systems, or ATACMS for short.