The latest price increases have added to concerns about the reliability of the oil and natural gas flowing from Russia , which is a major supplier to Europe but has increasingly wielded its energy resources for political leverage .
Europe /location/location/contains Russia
DT JJS NN NNS VBP VBN TO NNS IN DT NN IN DT NN CC JJ NN VBG IN NNP , WDT VBZ DT JJ NN TO NNP CC VBZ RB JJ PRP$ NN NNS IN JJ NN .
Europe
LOCATION
Russia
LOCATION
/location/location/contains