Environmentalist groups in Germany and the Netherlands are challenging plans for a new gas field in the North Sea, a German non-profit organisation said on Friday, possibly complicating Europe's hunt for alternatives to Russian fuel. Environmental Action Germany (DUH) said it had filed the lawsuit with the Court of Justice in The Hague together with Dutch organisation Mobilisation for the Environment (MOB) and a citizens' initiative from the coastal region of East Frisia. Privately-owned Dutch company ONE-Dyas has been given the go-ahead by Dutch authorities to develop its N05-A gas field in the North Sea, straddling German and Dutch waters,...