NEW : Mubarak must stay in office , Obama envoy says . Comment: Issues like terrorism and the START treaty are being addressed . START takes effect after Clinton , Lavrov exchange instruments of ratification .
NEW : Mubarak must stay in office , Obama envoy says . The Quartet notes the effect of Egypt 's unrest on Mideast peace process . Issues like terrorism and the START treaty are being addressed . START takes effect after Clinton , Lavrov exchange instruments of ratification .