Abramovich subsequently agreed to the merger .
When Berezovsky had a confrontation with Putin , and felt compelled to leave Russia for London ( where he was granted asylum ) , he assigned his shares in Sibneft to Roman Abramovich .
Roman Abramovich subsequently agreed to the merger .
When Berezovsky had a confrontation with Putin , and felt compelled to leave Russia for London ( where he was granted asylum ) , he assigned his shares in Sibneft to Roman Abramovich .