Earlier requests for longer range systems were rebuffed, but things have changed

Zelensky thanked the U.S. for the system as well as the High Mobility Artillery Rocket Systems it’s received, but added that his troops “absolutely need the United States to show leadership and give Ukraine” additional air defense systems it has requested.

The Biden administration approved the shipment of six of the missile systems late last month as part of a nearly $3 billion lethal aid package to bolster Kyiv as it battles the Kremlin invasion.  
The NASAMS are considered “medium-range” systems, but are considered an improvement over prior missiles sent to Ukraine, which typically had a max range of 30 to 50 miles. The NASAMS are capable of defending against aircraft, cruise missiles, as well as drones and were designed by the US and Norway.
https://www.zerohedge.com/geopolitical/ukraine-confirms-receipt-longer-range-missiles-its-long-sought-us