UNITED NATIONS (Reuters) - Britain has asked for the U.N. Security Council to meet on Wednesday to discuss escalating deadly violence between Rohingya insurgents and Myanmar security forces in Rakhine state, Britain s U.N. Ambassador Matthew Rycroft said on Tuesday.  Need to address long-term issues in Rakhine, urge restraint by all parties,  Rycroft posted on Twitter.  A series of coordinated attacks by Rohingya insurgents on security forces in the north of Myanmar s Rakhine state on Friday has triggered a fresh exodus to Bangladesh of Rohingya Muslim villagers trying to escape the violence. 