I think satellites are susceptible to any form of explosion in orbit. I think most nations are working hard to ensure we don't do that. I think space and efforts in counter-space...there's lots of bluster that's out there, but I think if folks go around exploding things in orbit, it does just as much harm to their own assets as it would to an adversary because the debris that would be created from that is in those orbital paths. You risk just as much your own operations as the next guy's.
I think people bluster a fair bit on these topics, but, in general, the business of messing around with somebody else's satellite capability would be more subtle than causing explosions.