Mahmud Abbas (L) poses with Mohammad Mustafa in Ramallah on Thursday. AFP

Palestinian President Mahmoud Abbas has appointed Mohammed Mustafa, a long-trusted adviser on economic affairs, as prime minister, the official Wafa news agency said.

Mustafa's appointment comes less than three weeks after his predecessor, Mohammed Shtayyeh, resigned, citing the need for change after the Oct.7 war.

The 69-year-old now faces the task of forming a new government for the Palestinian Authority, which has limited powers in parts of the Israeli-occupied West Bank.

Mustafa, who studied at George Washington University in Washington, is an independent executive committee member of the Palestine Liberation Organisation — dominated by the ruling Fatah movement.

He has served as deputy prime minister for economic affairs, held a board seat at the Palestine Investment Fund and worked in a number of senior positions at the World Bank.

He has also advised the Kuwaiti government and the sovereign wealth fund of Saudi Arabia, the Public Investment Fund.

Since 2007, control of the Palestinian territories has been divided between Abbas's Palestinian Authority in the West Bank and Hamas in the Gaza Strip.

Mustafa was involved in reconstruction efforts in Gaza after Israel's 2014 invasion.

'Right-hand man'

Mustafa's appointment represents an attempt to bolster Palestinian institutions and "close some loopholes in the Palestinian Authority" at a time when Abbas is "under siege and under pressure" from Israel and the United States, Palestinian analyst Abdul Majeed Sweilem told AFP.

Mustafa would likely be seen as "acceptable to the Americans as he follows a liberal approach," Sweilem added.

Yet Khalil Shaheen, political analyst and writer, said Mustafa's closeness to Abbas limits prospects for major change.

"In the end, the man (Mustafa) remains the right-hand man of President Abbas... Abbas wants to say that he supports reforms, but they remain under his control," Shaheen said.

Shortly after Shtayyeh's resignation in late February, Palestinian factions including Hamas and Fatah participated in talks hosted by Russia that addressed the war in Gaza and post-war plans. Afterwards the factions said in a statement they would pursue "unity of action" in confronting Israel.