"Erdogan will be shooting himself in the foot if he does either because it would just push the US into the arms of the Syrian Kurds", Rubin told the Washington Free Beacon on Monday.
Although they are allies in North Atlantic Treaty Organisation, conflicting goals between Turkey and the United States in the Middle East are seen as one factor leading Ankara to cultivate closer ties with Iran. On May 9, the Trump administration approved a Pentagon plan to provide heavy weapons to Kurdish YPG rebels fighting to expel Islamic State from Raqqa, capital of its self-proclaimed caliphate.
Erdogan is in Washington to try to convince the US President to reverse the decision to arm the Kurdish fighters and to brief Trump on a proposed peace plan for Syria that Ankara has reached with Russian Federation and Iran, and involves the creation of four de-escalation zones within the country.
The US has attempted to reassure its North Atlantic Treaty Organisation ally that the weapons will not reach the PKK, which both nations consider a terrorist group, while promising to find a role for Turkey in the fight for Raqqa.
According to the White House, Trump and Erdogan are expected to "discuss how to further strengthen our bilateral relationship and deepen our cooperation to confront terrorism in all its forms".
USA military officials have contended the YPG is the only force on the ground capable of forcing ISIS out of Raqqa in the near future. Take a look at the great spymaster Vladimir Putin's statement about the Kurds in Syria. The hope of Tuesday's meeting is that both sides will see that if the US becomes the friend of Turkey's enemy, it does not necessarily mean it becomes the enemy of Turkey. Isis fighters can only move in and out of Raqqa by boat, though they have proved in Mosul that they are skilled in urban warfare using sniper teams, suicide bombers and booby traps to slow down and inflict losses on a more numerous and better armed enemy. Russian Federation and the USA could help Turkey get better relations with Syria's Kurds. So why is President Erdoğan's visit to Washington being packaged as if it is the most critical meeting of his career? Its local Arab and Turkman allies were unable to take the Isis stronghold of al-Bab without Turkish army intervention. And this is really about trying to give Turkey a big hug.
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It has always been obvious that President Recep Tayyip Erdogan is more interested in targeting the Kurds than in fighting Isis. He is also arguing that Turkey, Saudi Arabia, and Qatar can offer more resolute military backing than YPG. His government has insisted it may attack Syrian Kurdish fighters again.
Mr McMaster said he was in the room and "it didn't happen".
"There are some documents and information we have prepared, which we will present to him", Erdogan said on Friday.
Whereas the Turkish government has always been proposing its North Atlantic Treaty Organisation ally for launching Raqqa operation with Turkey-backed Free Syrian Army (FSA) fighters and Erdogan is expected to raise the offer once more during his talks with Trump. This makes it hard for the Turkish army and air force to escalate its attacks on the YPG.
With Mr. Trump standing by his side, Mr. Erdogan denounced Washington's Syrian Kurdish allies and said he would never accept them as partners in the region. Among the "suspects" are former CIA Director John O. Brennan, New York Senator Chuck Schumer, US Attorney for the Southern District of New York, Preet Bharara, Office of Foreign Assets Control (OFAC) President, David Cohen and Henri Barkey, and the Director of the Middle East Program at Wilson Center. But they regard the issue of arming the YPG as touching on national security.
The Syrian Kurds are anxious that, once Isis is defeated, the USA will no longer need them and will revert to its old alliance with Turkey as a member of North Atlantic Treaty Organisation and a major power.