NEW : The EU ` ` calls for the early appointment of a successor '' for Algeria . Supervision Mission in Syria to monitor the efforts to forge the plan . U.N. Secretary - General Ban Ki - moon announced the move with ` ` deep regret '' . League Secretary - General Ahmed El Araby and others are calling for a successor . U.S . Ambassador : Security Council vetoes made Annan 's mission impossible .
NEW : The EU ` ` calls for the early appointment of a successor '' for Algeria . U.N. Secretary - General Ban Ki - moon announced the move with ` ` deep regret '' . League Secretary - General Ahmed El Araby and others are calling for a successor . U.S . Ambassador : Security Council vetoes made Annan 's mission impossible .