Belarusian YouTube channel called “ВоенТВ Беларуси” has recently published a video telling about the Belarusian military news. In that video, they showed an unmanned aerial vehicle carrying an anti-tank grenade launcher. The demonstration of this rather unusual UAV was conducted in Losvida proving ground located in Vitebsk Region, Belarus. The mentioned video is embedded below and it starts from the point where it shows the UAV.
As you can see, they have basically built a quadcopter drone around an anti-tank grenade launcher. The appearance of this UAV makes me think that it is still in development. No information was disclosed concerning the manufacturer, the grenade launcher used and their plans of adopting this UAV. The launcher is probably a Russian RPG-26 anti-tank rocket-propelled grenade launcher. Theoretically, such a UAV can be equipped with any recoilless weapon.
The video demonstration shows how the UAV advances towards the target, approaches and hits it. I think bringing such a UAV too close to the enemy will probably be not a good idea, because it is actually quite a large target at such close proximity. It will probably be most effective if used at a relatively safe distance from the enemy to keep it from being detected and engaged by the enemy personnel. In the case if it has to come close to the target, then probably it would be a better idea to keep it elevated high enough to minimize the possibility of being detected but low enough to stay within the effective range of the anti-tank rocket it shoots to make an accurate shot. In case of the RPG-26, that effective range is about 250 meters.
In the same video, there was also another similar Belarusian UAV concept spotted (see the images below). This one has a more complete appearance and carries two anti-tank grenade launchers.