The American Enterprise Institute published in August 2020 a study titled "Gulf Financial Aid and Direct Investment: Tracking the Implications of State Capitalism, Aid, and Investment Flows" by Karen E. Young.
The report describes the breadth and scope of Gulf State aid and financial flows into Djibouti, Egypt, Ethiopia, Jordan, Oman, Pakistan, Sudan, and Yemen. China is capturing most of the press attention; the Gulf States collectively are much bigger players in these countries.