Russian President Vladimir Putin on Tuesday ordered officials to tighten control of the border with Ukraine after a spate of drone attacks that Russian authorities blamed on Kyiv delivered a new challenge to Moscow more than a year after its full-scale invasion of its neighbor. One drone crashed just 100 kilometers (60 miles) away from Moscow in an alarming development for Russian defenses. While Putin didn’t refer to any specific attacks in a speech in the Russian capital, his comments came hours after drone attacks targeted several areas in southern and western Russia and authorities closed the airspace over St. Petersburg in response to what some reports said was a drone.