Explosions hit Russian targets in and near occupied Crimea overnight into Wednesday, as Ukraine appeared to be intensifying attacks on Russian military strongholds ahead of an expected counteroffensive. In Crimea, the Ukrainian peninsula that Russia illegally annexed in 2014, drones struck a border guard post in Simferopol on Tuesday night, according to photos and video shared on social media and geolocated by Radio Liberty, a U.S. government-funded broadcaster. Ukraine did not directly claim responsibility for the incident, but Ukraine’s military intelligence spokesman, Andriy Chernyak, said in a statement on Wednesday morning: “Of course, the enemy must be cut off from...