Judging from the news that I have access to, it appears as if the residents of Mariupol in the southeast of Ukraine - hundreds of thousands of people - were stuck in a city without fresh water, food, or medicine. Although there are daily promises of "humanitarian corridors" through which civilians could leave, in practice, there have been no reports of anyone successfully evacuating from the city.
Would it be possible for a country or international body to provide humanitarian aid to Mariupol residents by dropping crates of essential supplies from the air, perhaps using unarmed drones? I seem to recall that such supplies were in fact dropped in various locations in Bosnia during the Yugoslav War (although I'm no longer sure who did that, and drones certainly weren't a thing back then).
What kind of political, economic, or other factors are there that prevent such an approach?
[Edit] Sorry I was a bit unclear. I also have the impression that Russia wants, or at least doesn't mind, Mariupol becoming a mass concentration camp. So the question really is, could something like this be done in spite of Russia?
For example, assuming that such an operation would be carried out under a mandate of the UN General Assembly, from a base in (say) Romania or Turkey, and giving Russian observers the opportunity to verify that the supplies involved are indeed humanitarian in nature, would Russia still have plausible justification for shooting down participating aircraft? Or would they do so anyway without plausible justification, even if this definitely exposes their intentions to cause civilian suffering and death?