Ping.
I love simplicity. Simply put, Russia arms Syria and Iran. The Russians are backstabbers. Russia is Israel's enemy. All other claims, appearances and seeming contradictions to this are a smokescreen.
1) Tell them you'll kill one of their comrades for every hostage killed.
2) Put barbed wire around the school. Security permitting, make a separate barbed-wire compound for the terrorists' comrades, visible from the school.
3) Hire Israel to fly in 200 of their special forces for standyby and/or attack on the school.
4) Afterwords, kill the requisite number of terrorists' comrades.
Obviously we couldn't do this in the US (and we wouldn't need to do step #3, what with Delta Force et al). But Russia is already a brutal, lawless place, and Putin is supposed to be ruthless. Why the heck not?
Colin Powell is and always has been an asshole. I wish I knew how we (the US) could rid our foreign service of these people.