 Complete the following phrase:  Nassers regional position changed unexpectedly when Yemeni officers led by Nasser supporter Abdullah al-Sallal overthrew Imam Badr of North Yemen on 27 September 1962. Al-Badr and his tribal partisans began receiving increasing support from Saudi Arabia to help reinstate the kingdom, while Nasser subsequently accepted a request by Sallal to militarily aid the new government on 30 September. Consequently, Egypt became increasingly embroiled in the drawn-out 