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This is known as a “pass-through” operation. The concept is quite simple, really. The Russians were notified of the attack and even took measures to arrest people they suspected of planning future attacks. However, if ordered, Russian intelligence could allow the attack to occur for domestic political purposes. In this case, letting Russian people die in a terrorist attack to gain patriotic fervor for the 100,000 men they were about to draft into the army to die in Ukraine. This makes much more sense and fits quite nicely with the Russian way of doing business.