EXPLAINER: What’s behind Russia’s natural gas cutoff?

FILE - Solar panels are installed at a floating photovoltaic plant on a lake in Haltern, Germany, on April 1, 2022. Russia's Gazprom says it is halting natural gas supplies to Poland and Bulgaria, escalating tensions between the Kremlin and Europe over energy and Russia's invasion of Ukraine — and adding new urgency to plans to reduce and then end the continent's dependence on Russia as a supplier of oil and gas. (AP Photo/Martin Meissner)