This Friday, April 28, 2017 still taken from video, shows USA forces patrolling on a rural road in the village of Darbasiyah, in northern Syria.
Turkish President Recep Tayyip Erdoğan has banned Kurdish political parties, imprisoned thousands of activists and said he will "never allow" the creation of a Kurdish state like Rojava on his borders.
The escalation led to USA patrols along the border in Syria. Those patrols followed a Turkish airstrike against bases of Syrian Kurdish militia, Washington's main ally in combating Islamic State militants in Syria.
The US moved troops and armoured vehicles through Syria on Friday and Saturday, to dissuade Turkey and Syrian Kurdish forces from attacking each other.
Now U.S. troops are trying to stop the outbreak of violence between two of their closest allies in the region from escalating.
The Syrian Kurdish Peoples' Protection Units (YPG) are seen by Washington as the most effective fighting force in the battle against jihadists in Syria.More news: Murray loses to Thiem in Barcelona Open semifinals
A YPG commander said on Friday that USA forces would begin monitoring the situation along the Syria-Turkey frontier, according to Reuters.
Turkish President Recep Tayyip Erdogan was asked by Turkish state-run news agency Anadolu about the border patrol, and said Turkey is "seriously concerned to see US flags in a convoy that has YPG rags on it".
In 48 hours of fighting, the Observatory said at least 87 insurgents from the warring sides were killed. It launched airstrikes against the YPG last week, killing 20 fighters and media activists.
But it has complicated relations with Turkey, which views the group's Kurdish component as an extension of a terror group operating inside its own borders.
On Saturday, more USA troops in armored vehicles arrived in Kurdish areas, passing through the town of Qamishli, close to the border with Turkey.
The area, which includes Arbin, has been held under siege by government forces for more than three years.More news: All 100 Senators Invited To White House For North Korea Briefing
Erdogan said the sight of American flags in the convoy alongside YPG insignia had "seriously saddened" Turkey. Some footage posted online showed Kurdish residents cheering US -flagged vehicles as they drove by.
Kurdish officials describe the United States troop movement as "buffer" between them and Turkey.
The goal is "to discourage escalation and violence between two of our most trusted partners in the fight to defeat" Daesh, the statement said, adding that all parties in the region should remain focused on defeating the terror group.
The issue has been a source of tension between Ankara and Washington that threatens to hamper the fight against the Islamic State. Instead of working with the Syrian Kurds, Turkey is pressing the U.S.to let its army join the campaign for Raqqa, the self-proclaimed capital of IS.
His comments come ahead of a meeting with President Donald Trump in mid-May in the United States.
"America, the coalition, and Turkey can join hands and turn Raqqa into a graveyard for [ISIL]", Erdogan told a business summit in Istanbul.More news: Kia invests $1 billion to build cars in India
Turkey has banned popular matchmaking shows, "In radio and television broadcasting services, such programs in which people are introduced with the objective of finding a friend or searching for a spouse... can not be permitted,"says a statement in Turkey's Official Gazette, which publishes new legislation".