Thumpalumpacus
Major
It's the poor chaps surrounded and besieged in in Mariupol that need weapons and reinforcements. Some sort of parachute drop or delivery from the sea?
Ukrainian troops in Mariupol are taking ammo off Russian soldiers and smuggling in weapons to hold out against the assault
There has been "continuous heavy shelling" in the port city since Russia invaded Ukraine on February 24.news.yahoo.com
Delivery from sea will need Turkish approval; that's uncertain.
Whose airplanes would do the airdrops in your scenario? Do the Ukrainians have the lift-capacity?