New Delhi (CNN) Could India and Pakistan really go to war? This is a question that has long been purely rhetorical - and almost absurd. After all, both countries have long been nuclear powers, a deterrent that encompasses the lives of a combined 1.4 billion people. Both nations have also seen some years of relative peace along their border, a break from the wars that pockmarked the 20th century. And yet. Today the question seems less absurd, and more urgent. India is claiming to have launched what it calls a "surgical strike" across what is known as the Line of Control with Pakistan. India's version of events is that its strike attacked a terrorist launching pad. Pakistan denies that the site of the attack was a terrorist base, pointing out that two of its soldiers have been killed.