Russian energy company Gazprom has again demanded confirmation from Germany’s Siemens Energy of the return of a missing turbine for the Nord Stream 1 gas pipeline between Russia and Germany. Gazprom has again asked Siemens to provide written confirmation of an exemption from applicable sanctions regulations, which in turn is the basis for the return of the turbine to Russia, the state-owned company said on Friday. “But Siemens has not provided them [the documents] so far.” The Russian energy giant has significantly reduced gas deliveries through Nord Stream 1 since June, citing the missing par…