Liberation movements want a place at the table. The Islamic State, on the other hand, wants to destroy the table. The Islamic State isn't simply an insurgency. Though it certainly aspires to overthrow the current regimes in Damascus and Baghdad, it doesn't have any particular attachment to this territory. It maintains a warm spot for the holy sites in Saudi Arabia. Otherwise, it doesn't care about national boundaries.
Whether this ceasefire or some future one proves durable, Ukraine must eventually make some very difficult decisions concerning its future. Above all, it must figure out a way of exiting the steel trap that has clamped down on its nether regions. The Crimean peninsula has already been sliced off. Should Ukraine sever another one of its own limbs in order to survive?
There already are those who try to connect President Obama's decision to attack to the ever devious Israel connection. In that case they owe an explanation as to the position of the Arab League in support of the presumed strike, also that of PM Erdoghan and others who are not exactly lovers of Zion.