[U-238]

I think Hamas knows what will happen if they join Iran in a war.

[A Navy Vet]

Agreed. They're punks, but do recognize a losing side when they see it. I, personally, don't think any other nation or NGO will get involved if Israel goes full tilt on Iran. All the bad guys in the ME will recognize that Israel is serious and cower for another day.

I also don't believe that Russia or China will get involved. They will probably hope for a quick and decisive strike so they can get on with their own politics and economies. Many will make their noises, but once Israel makes her point, the world will go about its business. Watch.