Serhii Bosak

3 days ago | wsj.com | James Marson |Jane Lytvynenko |Brenna Smith |Serhii Bosak

Lt. Gen. Vasyl Maliuk, a 42-year-old career security officer with broad shoulders and a stern mien, has earned a reputation for innovative operations with explosive naval and aerial drones that forced Russia to withdraw much of its Black Sea Fleet from its base in occupied Crimea and damaged dozens of oil plants and military-production facilities deep inside Russia. But the task was formidable.