Houthi attacks on Saudi Arabia test limits of Mecca regional security pact. Just a month after Saudi Arabia signed a regional mutual defence deal with Pakistan and Turkey, attacks by Yemen’s Houthis against the kingdom’s energy infrastructure and military sites are testing the pact’s limits. At a hastily convened meeting of the Mecca Joint Defence Agreement in Riyadh on Friday, military chiefs of the three parties reaffirmed their commitment to collective defence, according to the.