Russian Foreign Minister Sergei Lavrov has advised President Vladimir Putin to continue negotiations with NATO on security guarantees. “There is always a chance,” Lavrov said he told Putin. But they can not drag on indefinitely, he said. The top diplomat’s advice is a sign that Moscow might be willing, for now, to pursue a diplomatic path to ease tensions, even as Washington says Russia could invade Ukraine at any time. To defuse the Ukraine crisis, Russia is insisting on a halt to NATO’s eastward expansion and the rolling back of offensive weapons and troops. NATO rejects those demands but sa…