Ukraine has said it may restrict Russian gas supplies to Europe if gas monopoly Gazprom goes ahead with further cuts in Ukrainean supply.State-owned Gazprom says it will cut supplies of gas to Ukraine by a further 25% on Tuesday, but had said shipments to Europe would be unaffected.
A large proportion of the gas Russia sells to Europe passes through pipelines in Ukraine.
The dispute began after Russia said Ukraine had not paid its debts.
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