What nations could currently destroy the ISS? Currently meaning right now in March, 2014. The reasons why are irrelevant. Assume the nation’s government is backing the attack and has complete access to all national resources, rather than a rogue general acting on his own.
Here are the qualifiers:
The attack must happen within 48 hours of the decision to do so.
The method of attack doesn’t matter: ground based laser systems, missiles from ship, shore, aircraft, or spaced based weapons to include steering a satellite on a collision course.
The ISS is either outright destroyed or the crew is killed and the ISS is sufficiently damaged that it realistically could not be repaired or salvaged.
What nations have this immediate capability and what methods or systems would they use?