Long negative beta securites, short positive betas, on margin. Sell calls on ETFs, buy puts on ETFs, etc. There's risk though because his actions are rather unorthodox and the full effects aren't known (and resulting fear can cause betas to shift drastically)

Or if the necessary capital is out of reach for margin trades or options (for his friends it isn't), buy long 3x inverse ETFs as much as you can risk.

If you expect him to play yo-yo some more, rinse and repeat buying either regular or inverse 3x ETFs as needed.

Is this happening at some scale? Surely. Is it the main purpose? Probably not. I'd expect there are easier ways for corrupt politicians and their cronies to profit.