The Javelin goes for about $100k per shot, though the command module is a little more, I think. The max range is 5 km, though I have heard some crazy stories about even further —by now it must be a little further.
You can use it against bunkers, buildings, heavy MBT’s and there are 3 different attack modes; you can tell it to pop-up downrange and terminate in a top-down attack.
In the case of an MBT this blows the turet off, where the armor is thinnest.
The Javelin is AWESOME.
But in spooky ops almost always they prefer to supply the closest WTO analogue derivative in order to preserve deniability —if they supplied the genuine US article I would be very surprised.