Saudi Arabia’s military in Yemen has moved in to secure two strategic Red Sea ports and the Bab al-Mandeb Strait after its leading ally the United Arab Emirates substantially reduced its presence there, four sources familiar with the matter said.

The UAE has drawn down its numbers in some parts of Yemen, where it had set up large bases amid a four-year-old multi-layered war that is widely seen as a proxy battle between regional rivals Saudi Arabia and Iran.

Two Yemeni military commanders and two Yemeni government officials told Reuters that Saudi officers had taken command of military bases at the ports of al-Mokha and al-Khokha, which Emirati forces had used to back their campaign in nearby Hodeidah and to monitor the coastline.

Riyadh has also sent an unspecified number of troops to the southern port city of Aden and Perim Island, a small volcanic rock in the strategic Bab al-Mandeb shipping lane where the Red Sea meets the Gulf of Aden.

The spokesman for the Saudi-led coalition and the UAE government did not respond to requests for comment.

A senior Emirati official has said the UAE is not leaving a vacuum in Yemen as it trained about 90,000 local fighters and remains committed to the coalition and the Yemeni government. The UAE discussed extensively its troop redeployment with Riyadh, the official said.

The change in command is not expected to significantly affect the course of the war, nor a U.N.-backed ceasefire in Hodeidah which was signed last year in Sweden between the Saudi-backed government and the Iran-aligned Houthis.

Riyadh has remained supportive of U.N. peace efforts despite an uptick in Houthi missile and drone strikes on airports in southern Saudi Arabia over the last two months.

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The change coincides with growing tensions between Washington and Tehran, with the United States seeking to form a military coalition to protect international shipping from Iranian attacks off the coast of Yemen and near the Strait of Hormuz on the other side of the Arabian Peninsula.

On Thursday, three Iranian vessels tried to block a British tanker passing through Hormuz.

Iran has threatened to close the strategic waterway in response to U.S. calls to reduce its oil exports to zero.

Perim Island, in the middle of Bab al-Mandeb, was under the control of the UAE military since 2015, when the coalition intervened in Yemen’s war, until recent weeks as Saudi Arabia took over along with Yemeni coast guards, the sources said.

Tens of thousands of Yemeni and Sudanese troops are positioned in the area and on the southern outskirts of Hodeidah, where warring parties agreed on a ceasefire to pave the way for talks to end the war.Reuters