ProductionGazprom hits Poland with fresh arbitration claimRussian gas giant seeks upward price revision for gas deliveries to Poland from 2014 despite losing earlier arbitration and paying $1.5 billion to PGNiGDeep freeze: a man walks on the stairs during snowfall in the city of Krakow, PolandPhoto: REUTERS/SCANPIXVladimir AfanasievMoscow