莫斯科坚持要观察员监督天然气输送过境乌克兰到欧洲的情况。检测的目的是确保乌克兰不在中途“偷气”。俄罗斯一直指责乌克兰偷气，但乌克兰予以否认。
Moscow insisted that observers monitor the flow of gas through Ukrainian territory to make certain Kyiv is not siphoning the fuel destined for Europe , an allegation Russia has made and Ukraine has denied .
偷气