Ukraine has struck the Druzhba pipeline carrying Russian oil to Hungary and Slovakia, even as widening attacks indicating the war is spreading to the Eurasian landmass. “The Druzhba oil pipeline is taking a rest,” crowed Robert “Magyar” Brovdi, Ukraine’s drone chief, on August 18. “Greetings from the Birds of the Unmanned Systems Forces.” The strike, the second in less than a week, took out the 4,000km (2,500-mile) pipeline, bringing to an indefinite halt oil flows which had been supplying Central Europe via Ukraine and Belarus since the early 1960s. The language was tongue-in-cheek, but the destruction of the Nikolskoye oil...