As for China supplying Russia? The only thing Russia would want/need from china are attack drones, they are not going to run out of gear, ammo or supplies any time soon. The biggest issue is manpower they can only have the 250k or so troops in Ukraine for so long befre they might need to add conscripts to the mix, Ukraine, on the other hand, is already past that so fields 3+x as many soldiers and US taxpayer check bock is limitless at present, so same problem only question is how many KIA they can afford, supplies will not run out , Brandon will drop another 50billlon $ next month if they need it for 10%, its the bodies that will run out first.
Ukraine needing arms is somewhat of an irony, Ukraine at one point had 4th largest arsenal in the world but being the world's no.1 arms bazaar they sold everything off that could be sold even after the war started in 2014
There were/are supposedly 2500 ish folks in Azovstal from reportedly 15k originally in defense of Mariupol . So far only ones they are talking about exchanging are the seriously wounded -> amputees. For others i think trials ,gulag and some might probably face a firing squad (at least those they identified shooting Russian POWs in some videos)
At this stage is artillery war. Thousands of MANPADS have greatly reduced attack helicopter effectiveness keeping them at stand off ranges. The main CAS are now old SU25 and Su24 which were about to be retired prior to this war. As the attack runs are low level and high speed their exposure to MANPADS is short hence few if any losses in past weeks . Still active S300 here and there prevent free roaming above manpad altitudes.
So 80's style low level unguided rocket runs. Note the paint chipping on the canopy cable channel , in any case must hell running a gauntlet of all those MANPADS daily