A stand-off over the return of a turbine that Russia says is holding back gas supplies to Europe showed no sign of being resolved on Thursday, with Moscow saying it needed documentation to confirm the equipment was not subject to sanctions. Germany’s Siemens Energy (ENR1n.DE) carried out maintenance in Canada on the turbine for the key Nord Stream 1 gas pipeline and said on Thursday it was ready to be returned immediately. But Russian gas exporter Gazprom reiterated sanctions imposed by Canada, the European Union and Britain prevented the equipment from being shipped back to Russia. It added three other turbines also needed major overhauls, and only […]