European natural gas prices surged again on Monday as Russia ratcheted up tensions by cutting off supply to another customer and the Kremlin sowed further doubts about equipment needed to boost flows on Nord Stream 1 (NS1). 

Gazprom PJSC said Saturday that it has stopped delivering natural gas to Latvia “due to violation of the conditions for gas withdrawal.” The company provided no further details. It has already halted supplies to Bulgaria, Finland, Poland and other customers in Denmark, Germany and the Netherlands for failure to pay for gas with rubles. 

Latvia said the move would have little impact on its supplies. The country already passed a legislative amendment to ban Russian imports. Gazprom announced the shut off days after Latvia said it was paying for the fuel in...