By Michael Holden, Andrew MacAskill and Andrius Sytas LONDON (Reuters) – Britain sanctioned two more Russians on Thursday – industrialist Alisher Usmanov and former deputy prime minister Igor Shuvalov – after criticism that it was taking too long to target people with links to Russian President Vladimir Putin. Usmanov – an Uzbekistan-born metals and telecoms tycoon who Britain said was worth $18.4 billion – is best known in Britain for his investment in and former sponsorship of Premier League soccer clubs Arsenal and Everton. Shuvalov is a former aide to Putin who now chairs Russian bank VEB,…