MOSCOW – Ukrainian drones struck wealthy districts of Moscow on Tuesday, in what one politician called the most dangerous attack since World War II, while Kyiv was also hit by air for the third time in 24 hours. Drone attacks deep inside Russia have intensified in recent weeks, with strikes on oil pipeline installations and even the Kremlin earlier in May that Moscow has blamed on Ukraine. Tuesday’s early morning raid targeted some of Moscow’s wealthiest areas, including where Russian President Vladimir Putin and the elite have homes. The leader was in the Kremlin later and received a briefing on...