WASHINGTON — Twitter said Monday it has suspended more than 200,000 accounts that it believes were part of a Chinese government influence campaign targeting the protest movement in Hong Kong. The company also said it will ban ads from state-backed media companies, expanding a prohibition it first applied in 2017 to two Russian entities. Both measures are part of what a senior company official portrayed in an interview as a broader effort by Twitter to curb malicious political activity on a popular platform that has been criticized for enabling election interference in the U.S.