The US no longer makes leave in place mines. They are all command detonated.
We continue to use them on the Korean divide, probably the most heavily mined place on earth. And while we've definitely updated our arsenal, I would not bet my life on the reliability of these ostensibly more advanced systems.
The cluster bombs… We’re actually phasing them out of our arsenal.
Sure. By selling them to our allies.
Largely because Russia and China still use them and they’re very effective.
Well, they're cheap by tonnage, which is why the Russians love them. But they're also unreliable, which is what makes them so dangerous. They don't always detonate where they land, and that makes them function as land mines after the fact. They are only "effective" in the sense that they're explosive devices that litter a large area.
As to China, when was the last time they bombed anyone? Like, at all? To my knowledge, the Chinese haven't been involved in a war since they signed a peace deal with Vietnam in the 70s. The closest we've seen has been police actions along border territories (Xinjiang getting a bunch of jihadist spillover from Afghanistan, slap fights with Indian border guard counterparts, etc). Who have they been dropping cluster bombs on, in living memory even?