But on Saturday he remained steadfast and defended his decision, saying he is an "island of one" for removing US forces from northeastern Syria.
The troops had evacuated border positions before the Turkish forces crossed into Syria Wednesday.
He also said it appears the USA -backed Kurdish forces, known as the Syrian Democratic Forces, are trying to "cut a deal" with the Syrian army and Russian Federation to launch a counterattack against the Turks.
But since the offensive began, an explosion occurred near a USA -led coalition base in the western town of Kobane, prompting the troops to pullout.
It said 74 members of the Kurdish-led Syrian Democratic Forces (SDF) and 49 Syrian rebels aligned with Ankara had also been killed.
Putin, a staunch backer of Assad, stopped short of condemning Turkey for sending its troops across the border into northeastern Syria earlier this week, but said that other nations should respect Syria's sovereignty and territorial integrity.
A US official says the situation in northeast Syria is "deteriorating rapidly" as Turkey-backed forces advance and could isolate American forces on the ground.
The official said Sunday the development is quickly increasing the risk of a confrontation between Turkey-backed and USA forces in the area.
The push deeper into northern Syria by Turkish troops came days after US President Donald Trump cleared the way for Turkey's air and ground invasion, pulling back US forces from the area and saying he wanted to stop getting involved with "endless wars".
The U.S. military has provided training, weaponry and assistance to the Kurdish forces to fight the ISIS until its latest enclave was finally brought down, however, with the Turkish invasion, Kurdish fighters have ceased operations against remnants of the terrorist organization.
The official said USA forces and their Kurdish allies no longer control ground lines of communication and have no control over Turkish aircraft overhead.
On Friday, U.S. Treasury Secretary Steven Mnuchin said President Donald Trump has authorized an executive order that will allow the Treasury in consultation with the president and Secretary of State Mike Pompeo "very significant new sanctions authority that can be targeted at any person associated with the government of Turkey, any portion of the government".
European Affairs Minister Amélie de Montchalin said the bloc was considering sanctions on Turkey over its action in Syria, adding that EU governments would not remain passive in the face of unnecessary bloodshed.
Speaking Sunday at the end of a Mass, Francis urged the worldwide community to work with "sincerity, honesty and transparency" toward finding "efficient solutions".
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Almost 200000 people displaced by Turkey's Syria offensive
President Donald Trump , and warned about a possible resurgence of Islamic State activity as a result of the military action. Ras al-Ain would be the first town to fall to Ankara's forces since the launch of its cross-border offensive on Wednesday.
On Saturday the United States appeared to also release funds for minorities in eastern Syria, at the same time that the USA continued to permit airstrikes on its own SDF partners and in areas where minority Christians and others live.
Trump's move drew worldwide criticism that he was abandoning the Kurds, U.S. allies who had fought in recent years with the Americans to defeat ISIL in northeastern Syria.
Trump defends the move as fulfilling a campaign promise to bring home USA troops.
The Syrian Observatory for Human Rights said pro-Ankara fighters "executed" at least nine civilians on Saturday near the town of Tal Abyad, another key target of the cross-border assault.
The Kurdish leader demanded that the USA either help stop the Turkish attacks or allow for them to create an alliance with the Assad regime in Damascus.
The Observatory said six people, including Khalaf, were killed by Turkey-backed opposition fighters on the road that they briefly cut before withdrawing. Aid agencies have warned of a humanitarian crisis, with almost a half-million people at risk in northeastern Syria. The fighting has reached the main highway that runs between Hassakeh, a major town and logistical hub, and Ain Eissa, the administrative center of the Kurdish-led areas.
The UN said its technical teams have not been able to access a water pumping station in Hassakeh town damaged from shelling, leaving 400,000 people, including 82,000 residents of displaced camps affected by the suspension of water.
SDF official Marvan Qamishlo told Reuters there were not have enough guards for the camp, which is north of Raqqa and about 30 km (20 miles) south of the Turkish border.
In Turkey, 18 civilians have been killed in cross-border bombardment, Turkish media and officials say.
Ankara says the objective of its assault it to defeat the Kurdish YPG militia - the main component of the Syrian Democratic Forces (SDF) - which it designates as a terrorist group over its links to insurgents in Turkey.
Underlining that Turkey is combating terrorism, he said the USA should not support terror groups YPG/PKK.
A Kurdish official on condition of anonymity said the clashes in Suluk were ongoing.
Turkey's Defence Ministry said on Sunday 480 YPG militants had been "neutralized" since the operation began, a term that commonly means killed. The number couldn't be independently verified.