By Vassia Barba A Russian official has claimed Joe Biden could cause an “accidental” nuclear war after concerns were raised about the 81-year-old US President’s cognitive abilities. It comes as special counsel Robert Hur’s report investigating his possession of classified documents described Biden’s memory as “hazy,” “fuzzy,” “faulty,” “poor” and having “significant limitations,” noting that he could not recall defining milestones in his own life such as when his son Beau died or when he served as vice president. In an interview with Russian newspaper Izvestia, Deputy Secretary of the Russian …