Britain yet to renew visa of Russian billionaire Abramovich - sources

MOSCOW/LONDON (Reuters) - British authorities, whose relations with Moscow have been strained, are yet to renew Russian billionaire Roman Abramovich's visa after it expired last month, two sources familiar with the matter told Reuters.Abramovich, best known in Britain as the owner of Premier League football club Chelsea, is in the process of renewing his visa as part of a standard procedure, one of the sources said.