Canada is wrestling with how to comply with sanctions on Russia’s oil-and-gas business without penalizing big customer — and Ottawa ally — Germany at the same time, a Cabinet minister said.Penalties on Russia for invading Ukraine left a turbine needed to help run the Nord Stream pipeline stranded in Canada. Soon after, Russia’s state-run gas giant Gazprom PJSC slashed supplies through the pipeline, the biggest gas link to the European Union, to just 40% of capacity.