LONDON (Reuters) – The three LetterOne shareholders not hit by Western sanctions have quit as directors and will no longer earn any income from the London-based investment group they co-founded with oligarch Mikhail Fridman as it tries to distance itself from Russia. The investment group said its new board, led by Chairman Mervyn Davies, would work to protect the 120,000 jobs associated with the group’s holdings after the European Union slapped sanctions on Fridman and co-founder Petr Aven last week. LetterOne, which counts telecoms groups Veon and Turkcell in its portfolio, said the three dep…