FILE PHOTO: General view of the gas station near the border between Ukraine and Poland in the settlement of Drozdovychi, 120 km (75 miles) west of Lviv, January 12, 2009. Russia, Ukraine and the European Union have now all added their signatures to a gas monitoring agreement aimed at restarting blocked gas transit to Europe via Ukraine. REUTERS/Vitaliy Hrabar (UKRAINE)/File Photo
Escalating tensions between the West and Russia over Ukraine have raised concerns about vital Russian oil and gas flows to Europe, prompting the United States to offer reassurances that it will help its European allies find alternative supplies.
But that task may be mission impossible for Washington.
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