The Turkish shelling by assorted weaponry has targeted residential areas in Afrin, 63 km north of Aleppo province in northern Syria, leaving civilian casualties and big property losses, said SANA. Ankara views the YPG as a major threat because of its links to Kurdish insurgents in Turkey.
During a visit to London, U.S. Secretary of State Rex Tillerson said that the United States is "concerned about the Turkish incident" in northern Syria and called on both sides to show restraint, according to a pool report supplied to the Reuters news agency.
The YPG have been armed by the United States as part of the broader fight against the so-called Islamic State.
Turkey's President Recep Tayyip Erdogan said on Monday that Turkey is not interested in seizing Syrian territories, and that the ongoing operation in Afrin will end as soon as Turkey's objectives are met. "We are urging Turkey to de-escalate, exercise caution and avoid any actions that might risk conflict between Turkish and American forces", he added. However, a Turkish source said a White House readout did not accurately reflect the conversation.
The American officials spoke on condition of anonymity because they were not authorized to talk to the media.
"For us, the United States has a moral obligation to protect the democracy in this area", Mohamed told reporters in Washington.
Turkey said in an official statement that it had hit 108 Kurdish targets. "So it actually is not helpful to have these operations go on. We recognize that. And we're working with the Turks to try and minimize it". Ankara has said the operation will be swift, but Mr Erdogan's spokesman signalled an open-ended cross-border campaign, saying it would end only when some 3.5 million Syrian refugees now living in Turkey could safely return home. Speaking during a Pentagon briefing, he said it's "simply an idea floating around right now" and there has been no decision yet.
"Their presence has been to ensure the stability in Manbij", he said of USA troops. "But he failed to keep his promise and cheated us", Erdogan said.
He said the Red Crescent could accommodate many more people than expected but no civilians had come to the camps after the recent escalation in Afrin as they were not allowed to leave.
Addressing Turkish complaints that the United States has not kept to its promises to take back weapons supplied to the Syrian Kurdish fighters, the USA official in Ankara said Washington meant to "fulfil the commitment", without providing a time frame.
The offensive has opened a new front in Syria's multi-sided, seven-year war and complicated USA efforts in Syria. "Definitely I am optimistic because it is the only way to be at such moments", Staffan de Mistura said. Russian Federation plans to hold separate peace talks on Jan 29.
The operation is being carried out under the framework of Turkey's rights within global law, U.N. Security Council resolutions, its right to self-defense under the U.N. charter and respect for Syria's territorial integrity, it said. -Turkish goals in Syria and expressed concern about "destructive and false rhetoric coming from Turkey".
There has been no public response yet from the government in Damascus.