10 Apr 2021 / 08:59 H. * Suu Kyi video court hearing due amid report of treason charge * At least 536 civilians killed since coup - activist group * U.N. envoy to Myanmar warns risk of 'imminent bloodbath' * U.S. urges China to use influence to hold junta accountable * China foreign minister meets Southeast Asian counterparts April 1 (Reuters) - Myanmar activists burned copies of a military-framed constitution on Thursday two months after the junta seized power, as a U.N. special envoy warned of the risk of a bloodbath because of an intensified crackdown on anti-coup protesters. The United Nations envoy's warning follows a flare-up in fighting between the army and ethnic minority insurgents in frontier regions.