BRUSSELS (AP) — Russia’s ongoing confrontation with the West has ignited debate inside and outside the U.S.-led NATO alliance about what its responsibilities are, and how much of its time and effort should be spent to prepare for and if necessary counter Russian President Vladimir Putin’s military ambitions.

Ian Lesser, senior director for foreign and security policy at the German Marshall Fund of the United States, said NATO must remain mindful of other modern security challenges, including cyberterrorism, threats to energy supplies and armed Islamic extremism.