SEVIMLI, Turkey (Reuters) - Turkish and Russian troops in armoured vehicles held their first joint ground patrols in northeast Syria on Friday under a deal between the two countries that forced a Kurdish militia away from territory near Turkey’s border.

Turkey and allied Syrian rebels launched a cross-border offensive on Oct. 9 against the Kurdish YPG militia, seizing control of 120 km (75 miles) of land along the frontier.

Last week, Ankara and Moscow agreed to remove the militia fighters to a depth of at least 30 km (19 miles) south of the border and Russia has told Turkey that the YPG left the strip.

Turkish armoured vehicles on Friday drove across the border to join their Russian counterparts, according to Reuters television footage filmed from the Turkish side of the border. Around four hours later, they returned to Turkey.

Ground and air units were involved in the patrol around the Syrian border town of Darbasiya, the Turkish Defence Ministry said on Twitter, showing photos of soldiers studying a map and of four armoured vehicles.

On Wednesday, President Tayyip Erdogan said Turkey had information that the YPG, which Ankara sees as a terrorist group because of its ties to Kurdish militants in southeast Turkey, had not completed its pullout.

Russia is the Syrian government’s most powerful ally and helped it turn the tables in the country’s civil war by retaking much of the country from rebels since 2015. The Turkish-Russian deal last week allowed Syrian government forces to move back into border regions from which they had been absent for years.

Ankara launched its offensive against the YPG following President Donald Trump’s abrupt withdrawal of 1,000 U.S. troops from northern Syria in early October. The YPG helped the United States smash the Islamic State “caliphate” in Syria.

Four Russian vehicles and a drone also took part in Friday’s patrol, conducted in an area between 40 km east of Ras al Ain and 30 km west of Qamishli, a Turkish security source said.

The source said patrols would extend further along the border strip and drones would be used to ensure YPG fighters had left the area.

The source said there had been no direct clashes with Syrian government forces during the incursion.

Overnight, the defence ministry said Turkey had handed over to the Russians 18 Syrian government soldiers detained in Syria near the Turkish border this week.

The 18 men were seized on Tuesday during operations southeast of the Syrian town of Ras al Ain, part of an area where Turkey’s incursion took place, stretching some 120 km (75 miles) along the border to the town of Tel Abyad.

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ERDOGAN’S PLANS

Erdogan said on Thursday that Turkey planned to establish a “refugee town or towns” in a “safe zone” between Tel Abyad and Ras al Ain, part of a project which state media have said would cost 151 billion lira ($26 billion).

He met U.N. Secretary-General Antonio Guterres on Friday and had said he would ask him to call for a donors’ meeting to help finance Ankara’s plans to resettle Syrian refugees in the region.

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“I will say: ‘You make a call for an international donors’ meeting. If you don’t, I will make this call’,” Erdogan said on Thursday.

“If it doesn’t happen, we will establish a refugee town or towns between Tel Abyad and Ras al Ain,” he said, addressing a building contractor in the hall and saying he would ask him to play a role in the project.

Ankara has said it plans to resettle in Syria up to 2 million of the 3.6 million Syrian war refugees that it hosts.

Erdogan and Guterres discussed Turkey’s plan, U.N. spokesman Farhan Haq told reporters in New York on Friday.

“The Secretary-General stressed the basic principles relating to the voluntary, safe and dignified return of refugees. He informed the president that UNHCR (the U.N. Refugee Agency) will immediately form a team to study the proposal and engage in discussions with Turkish authorities,” Haq said.

According to plans Erdogan presented at the United Nations General Assembly in September, Turkey would resettle some 405,000 people between Tel Abyad and Ras al Ain.

Erdogan said leaders at the General Assembly had looked positively on the plans but declined to offer money.

“We have for years hosted millions of refugees in our lands. The support we have received from the international community has unfortunately just been advice,” he said.

“The mentality that regards a drop of oil as more valuable than a drop of blood does not see anything but its own interest in Syria and everywhere in the world.”

Last week Defense Secretary Mark Esper said the United States would beef up its military presence in Syria with “mechanized forces” to prevent Islamic State militants seizing oil fields.