The Biden administration gave Ukraine permission to use the long-range guided missile system inside Russian territory, reversing previous restrictions.

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.

The Ukrainian military has carried out its first strike on Russian territory using U.S.-made ATACMS ballistic missiles, RBC Ukraine has reported, citing a source from the Ukrainian Armed Forces.