By Joel Schectman, Christopher Bing and James Pearson WASHINGTON (Reuters) – A Ukrainian cyber guerrilla warfare group plans to launch digital sabotage attacks against critical Russian infrastructure such as railways and the electricity grid, to strike back at Moscow over its invasion, a hacker team coordinator told Reuters. Officials from Ukraine’s defense ministry last week approached Ukrainian businessman and local cybersecurity expert Yegor Aushev to help organize a unit of hackers to defend against Russia, Reuters previously reported. On Monday, Aushev said he planned to organize hacking …