Safe? Perhaps since it has been used for other conditions. But we can't be sure that it won't make things worse.
Effective? We don't know. The jury is still out and no proper trials have been completed. Whether they can be? Again, we don't know. Proper trials take time.
If and when scientific evidence that it works is available we would expect it to be offered to anyone with Covid-19. We're nowhere near that yet. There is no treatment that effects a cure - yet.
Yes, but this isn't a typical situation, it's a war zone where everybody's flying blind.
I'd rather risk it than end up on one of those ventilators.