This is a nightmare.
The problem isn't the antitank mines, which obviously aren't even buried. The problem is whether antipersonnel mines are buried around them.

If concussion can set these off, maybe they can be remote detonated by a sniper firing at them? That would in theory get rid of all the AT mines so you could send in a demining vehicle to remove the AP mines.

But that's a slow and expensive process. This looks like a legacy of war Ukraine is going to be dealing with for decades.