Surging energy prices and fears of a Russian invasion of Ukraine are making European leaders think hard about energy security - particularly their decades-old reliance on Moscow for natural gas.
The crisis shows Europe's vulnerability after years of limited progress in completing an "energy union" - a 2015 vision to allow affordable gas and electricity to flow across borders while diversifying suppliers and reaching climate goals.
As renewables like solar and wind are slowly built up and coal and other fossil fuels are phased out, Europe still needs natural gas, and it's dependent on Russia to get it.
That came into sharp relief as Europe's gas supply dropped and prices soared partly because Russia sold less gas than normal, squeezing households and businesses with rising costs.
With gas reserves low and concerns a war could interrupt pipeline flows from Russia, the European Union is focused on getting liquefied natural gas or LNG, by ship from United States, Qatar, Algeria and elsewhere until renewables catch up. Environmentalists fear making that even a short-term priority could set back Europe's goals to move away from fossil fuels.
