Explosions have been reported at two airfields in central Russia, hundreds of kilometers to the east of the combat zone in Ukraine. The incidents came as Russia has carried out a massive campaign of air strikes inside Ukraine targeting the country’s power grid and other civilian infrastructure. At least one large explosion occurred at a Russian military air base in the Saratov region, about 600 kilometers east of Ukraine, while another blast was reported by Russian state media at an airfield outside Ryazan, southeast of Moscow. Social-media posts by residents in the cities of Engels and Saratov seemed to show...