NATO Secretary General Mark Rutte made an unannounced visit to Kyiv to express solidarity with Ukraine during intensifying Russian missile attacks.The visit follows the deaths of 23 people in recent strikes on Kyiv and Dnipro, prompting President Volodymyr Zelenskyy to request more US-supplied air defense systems.Rutte arrived to coordinate with Ukrainian officials as the nation continues to counter Russian aerial threats and expand retaliatory drone strikes on foreign targets.