 It remains a contentious issue that as a result of the Russian-Ukrainian gas dispute in 2009, Polish PGNIG gas company did not receive contracted supplies of Russian gas from Ukraine.At the beginning of 2006 Russia greatly increased the price of gas for Ukraine to bring it in line with market values.The dispute between Russian state-owned gas supplier Gazprom and Ukraine over natural gas prices started in March 2005 (over the price of natural gas and prices for the transition of Gazprom's gas to Europe).