What is the relationship between Russell Investments and London Stock Exchange Group in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

July 9 (Reuters) - China's CITIC Group Corporation is in negotiations to acquire Russell Investments from London Stock Exchange Group Plc in what is expected to be a roughly $1.8 billion deal, according to people familiar with the matter.

Answer: parent_organization