For the first time, President Biden has given Ukraine the green light to use powerful American long-range weapons for strikes inside Russia, a U.S. official told NPR on Sunday.

The missiles, known as the Army Tactical Missile System, or ATACMS, can travel about 190 miles. Their use would enable Ukrainian troops to strike Russia's weapons stockpiles, logistical centers and airfields — which could help stop Russian forces from advancing on the battlefield and attacking Ukrainian cities.