Ukraine will need to take out Russia's key air defense systems...

Ukraine will need to take out Russia's key air defense systems deep behind the front lines to keep its new F-16 fighter jets operational, according to a new analysis, as the U.S.-made aircraft take to Ukraine's skies.

Kyiv will "notably need to continue efforts to target Russian air defense assets within the Russian rear and in occupied Ukraine with Western-provided long-range weapons to enable its use of F-16 jets," the Institute for the Study of War (ISW), a U.S. think tank, said on Sunday.

The F-16s can carry a range of weapons, including Western short- and long-range missiles.

Ukraine is permitted to use long-range Western weapons on Russian targets in Moscow-held Ukraine and in Crimea, but not on Russian assets inside its internationally-recognized borders. Kyiv has called for these restrictions to be lifted.

this is a hard task
seems like the US restricting Ukraine too much ....though you can see why they do that .
russia has no restrictions themselves but cries like a baby when Ukraine get whst they have although in much less uamntity than the russ .