By Silvia Aloisi and Richa Naidu PARIS (Reuters) -French food company Danone will shed control of its dairy food business in Russia in a deal that could lead to a write-off of up to 1 billion euros ($978 million), it said on Friday. Joining a lengthening list of global companies making costly exits from Russia over the war in Ukraine, Danone will be offloading a business representing about 90% of its operations in Russia, where it will retain its infant nutrition unit. “This is the best option to ensure long-term local business continuity,” a Danone statement said, adding the Russian dairy uni…