Russian-held Crimea, a popular tourism destination, suspended children’s summer camps and tourist activities until September 1, its governor said on Monday, as the peninsula reels from a fuel crisis due to Ukrainian attacks on its supply routes. Supplies of fuel and other products to Crimea have become strained as Ukraine has targeted both sea routes and supply roads from the north. The availability of petrol and diesel in Russia, the world’s third-largest oil producer, has also been undermined...