 Natural gas prices in the U.K. and Europe briefly spiked on Monday, after a report that Russias Gazprom may not send more supplies as expected following recent comments from Russian President Vladimir Putin. European natural gas futures - based on benchmark November Title Transfer Facility TTF futures in the Netherlands -- climbed to 107.70 euros per megawatt hour MWh before easing back to 94.82 euros, with similar rollercoaster moves seen for U.K. futures GWM00, 1.61. 