COPENHAGEN (Reuters) -Wind turbine maker Vestas posted a deep first-quarter loss and slashed its 2022 margin forecast due to the war in Ukraine and writedowns in its offshore business, reflecting an industry wide struggle to turn a profit despite record demand. Focus on renewables has intensified as the West steps up efforts to wean itself off Russian fossil fuels, but what Moscow refers to as its “special operation” in Ukraine has also boosted already soaring raw material and freight costs. “The business environment worsened significantly during the first quarter of 2022 due to Russia’s invas…