President Biden seems to be working along a very carefully crafted policy in allowing Ukraine to use the ATACM (Army Tactical Missile) system, made and supplied by the US, in the ongoing Russia-Ukraine war.
Firstly, he has, most importantly, limited his permission for use to the Kursk region, where the Ukrainians hold a chunk of Russian territory. This is an effort to help Ukrainian forces in the region who are confronting some 50,000 Russian and North Korean troops deployed for a counter-offensive.

