Saudi Arabia's re-engagement with Lebanon, Syria and Iraq will partially counterbalance the shifting regional influence of Turkey, Qatar and Iran. However, sectarian politics and the meddling of foreign powers will limit Saudi gains, making Riyadh more aggressive in the long term, particularly in Syria and Lebanon. On Feb. 2, Syria's transitional President Ahmad al-Sharaa traveled to Riyadh for his first diplomatic trip abroad, meeting Saudi Crown Prince Mohammed bin Salman and discussing economic, humanitarian and diplomatic cooperation. The visit came after Saudi Foreign Minister Prince Faisal bin Farhan arrived in Damascus on Jan. 24. Prince Faisal also visited Lebanon on Jan. 23, making him the first top Saudi diplomat to travel to Lebanon in 15 years. The minister reportedly conveyed Saudi Arabia's support for the Lebanese people and state while urging political reforms to unlock foreign aid and investments. Finally, Saudi Arabia and Iraq on Nov. 4 signed a memorandum...