Russian Gazprom has officially halted gas supplies to Europe via the Nord Stream 1 pipeline, cutting off flows completely to Germany for a period of maintenance that began at 01:00 GMT Wednesday and is scheduled to end at 01:00 GMT on Saturday. Fears are mounting across the European Union that Russia will delay flows beyond September 3rd as the Kremlin continues to use natural gas as a weapon against Western sanctions - an allegation Moscow has repeatedly denied. Gazprom has said the cutoff would be temporary, as planned, noting that the pipeline…