Other Arab nations were also part of the ADF, but they lost interest relatively soon, and Syria was again left in sole control, now with the ADF as a diplomatic shield against international criticism. The Civil War was officially paused at this point, and an uneasy quiet settled over Beirut and most of the rest of Lebanon. In the south, however, the climate began to deteriorate as a consequence of the gradual return of PLO combatants, who had been required to vacate central Lebanon under the terms of the Riyadh Accords.