MOSCOW (Reuters) -Gas supplies have resumed from Poland to Germany via the Russian Yamal-Europe gas pipeline, data from German network operator Gascade showed on Saturday, as flows have returned to a normal westbound direction, for the first time since December. There were no bids for further gas purchases after 0600 hours (0500 GMT) on Saturday in a westward direction, Gascade showed, so the resumption could be only temporary. Markets have been on edge amid Russia’s invasion of Ukraine. Russian commodity exports have not been seriously affected by the conflict. Gas in the section of the pipel…