Pale. And it’s worth noting that whatever we may be doing, we are not dropping bombs on Romania.
This is very much the point I’m trying to make. Doing so would require the government to order Facebook and Twitter (or whomever) to categorically deny all access from Syria and Iraq (discounting, of course, IP proxies). Do we really want the government to do that? And in the process of searching for target accounts or IPs, how many US citizens would have their own (innocent) communications compromised?
FWIW, this is exactly the kind of problem Edward Snowden exposed and people called him a “hero” for doing so. Are we supposed to say, “Oops, nevermind, we liked it better the way it was before?”
And how would you accomplish this? The US already tried monitoring all comms coming INTO the country, and it required them to physically splice the fibers at the point where they entered US territory. (And people immediately denounced the government for being an evil Orwellian state.) If you wanted to catch every IP coming OUT of the region, you would have to fly to Syria and install your splices there.
This can be fixed. 
Messing with their internet may well be on Obama’s bucket list.
Dial-up still works - the basic phone line is internet infrastructure.