Targeting Turkey’s economy, President Donald Trump announced sanctions Monday aimed at restraining the Turks’ assault against Kurdish fighters and civilians in Syria.

The United States also called on Turkey to stop the invasion and declare a ceasefire, and Trump is sending Vice President Mike Pence and national security adviser Robert O’Brien to Ankara as soon as possible in an attempt to begin negotiations. Pence said Trump spoke directly to Turkish leader Recep Tayyip Erdogan, who promised not attack the border town of Kobani, which in 2015 witnessed the Islamic State group’s first defeat in a battle by U.S.-backed Kurdish fighters.

“President Trump communicated to him very clearly that the United States of American wants Turkey to stop the invasion, implement an immediate ceasefire and to begin to negotiate with Kurdish forces in Syria to bring an end to the violence,” Pence said.

In this photo released by the Syrian official news agency SANA, Syrian troops deploy in the northern town of Tal Tamr, Monday, Oct 14, 2019. The move toward Tal Tamr came a day after Syria's Kurds said Syrian government forces agreed to help them fend off Turkey's invasion — a major shift in alliances that came after President Donald Trump ordered all U.S. troops withdrawn from the northern border area amid the rapidly deepening chaos. (SANA via AP)
In this photo released by the Syrian official news agency SANA, Syrian troops deploy in the northern town of Tal Tamr, Monday, Oct 14, 2019. (SANA via AP)

Trump said the approximately 1,000 U.S. troops who had been partnering with local Kurdish fighters to battle IS in northern Syria are leaving the country. They will remain in the Middle East, he said, to “monitor the situation” and to prevent a revival of IS — a goal that even Trump’s allies say has become much harder as a result of the U.S. pullout.

The Turks began attacks in Syria last week against the Syrian Kurdish fighters, whom the Turks see as terrorists. On Monday, Syrian government troops moved north toward the border region, setting up a potential clash with Turkish-led forces.

In this photo taken from the Turkish side of the border between Turkey and Syria, in Akcakale, Sanliurfa province, southeastern Turkey, smoke billows from fires on targets in Tel Abyad, Syria, caused by bombardment by Turkish forces, Sunday, Oct. 13, 2019. The United Nations says at least 130,000 people have been displaced by the fighting in northeastern Syria with many more likely on the move as a Turkish offensive in the area enters its fifth day. (AP Photo/Lefteris Pitarakis)
In this photo taken from the Turkish side of the border between Turkey and Syria, in Akcakale, Sanliurfa province, southeastern Turkey, smoke billows from fires on targets in Tel Abyad, Syria, caused by bombardment by Turkish forces, Sunday, Oct. 13, 2019. (AP Photo/Lefteris Pitarakis)

Trump said Turkey’s invasion is “precipitating a humanitarian crisis and setting conditions for possible war crimes,” a reference to reports of Turkish-backed fighters executing Kurdish fighters on the battlefield.

The Kurdish forces previously allied with the U.S. said they had reached a deal with President Bashar Assad’s government to help them fend off Turkey’s invasion, a move that brings Russian forces deeper into the conflict.

In his sanctions announcement, Trump said he was halting negotiations on a $100 billion trade deal with Turkey and raising steel tariffs back up to 50%. Trump also imposed sanctions on three senior Turkish officials and Turkey’s defense and energy ministries.

“I am fully prepared to swiftly destroy Turkey’s economy if Turkish leaders continue down this dangerous and destructive path,” Trump said.

A Turkish youth celebrates with a national flag after news about Syrian town of Tal Abyad, in Turkish border town of Akcakale, in Sanliurfa province, Sunday, Oct. 13, 2019. Turkey's official Anadolu news agency, meanwhile, said Turkey-backed Syrian forces have advanced into the center of a Syrian border town, Tal Abyad, on the fifth day of Turkey's military offensive. (Ismail Coskun/IHA via AP)
A Turkish youth celebrates with a national flag after news about Syrian town of Tal Abyad, in Turkish border town of Akcakale, in Sanliurfa province, Sunday, Oct. 13, 2019. (Ismail Coskun/IHA via AP)

Treasury Secretary Steven Mnuchin said the sanctions will hurt an already weak Turkish economy. Pence said the U.S. will continue to ramp up the sanctions “unless Turkey is willing to embrace a ceasefire, come to the negotiating table and end the violence.”

American troops consolidated their positions in northern Syria on Monday and prepared to evacuate equipment in advance of a full withdrawal, a U.S. defense official said.

FILE - In this Aug. 28, 2019, file photo, Secretary of Defense Mark Esper speaks to reporters during a briefing at the Pentagon. Esper says the
FILE – In this Aug. 28, 2019, file photo, Secretary of Defense Mark Esper speaks to reporters during a briefing at the Pentagon. (AP Photo/Manuel Balce Ceneta, File)

The official, who was not authorized to be quoted by name, said U.S. officials were weighing options for a potential future counter-IS campaign, including the possibility of waging it with a combination of air power and special operations forces based outside Syria, perhaps in Iraq.

The hurried preparations for a U.S. exit were triggered by Trump’s decision Saturday to expand a limited troop pullout into a complete withdrawal.

Defense Secretary Mark Esper said Monday he would travel to NATO headquarters in Brussels next week to urge European allies to impose “diplomatic and economic measures” against Turkey — a fellow NATO ally — for what Esper called Ankara’s “egregious” actions.

Turkey's President Recep Tayyip Erdogan speaks to Turkish journalists, in Istanbul, Sunday, Oct. 13, 2019. Erdogan has rejected offers for mediation with Syrian Kurdish fighters as the Turkish military continues its offensive against them in northern Syria. (Presidential Press Service via AP, Pool)
Turkey’s President Recep Tayyip Erdogan speaks to Turkish journalists, in Istanbul, Sunday, Oct. 13, 2019. Erdogan has rejected offers for mediation with Syrian Kurdish fighters as the Turkish military continues its offensive against them in northern Syria. (Presidential Press Service via AP, Pool)

Esper said Turkey’s incursion had created unacceptable risk to U.S. forces in northern Syria and “we also are at risk of being engulfed in a broader conflict.”

The only exception to the U.S. withdrawal from Syria is a group of perhaps 200 troops who will remain at a base called Tanf in southern Syria near the Jordanian border along the strategically important Baghdad-to-Damascus highway. Those troops work with Syrian opposition forces unrelated to the Kurdish-led fighters in northern Syria.

Esper said the U.S. withdrawal would be done carefully to protect the troops and to ensure no U.S. equipment was left behind. He declined to say how long that might take.

With airstrikes and artillery, Turkey has launched an offensive aimed at crushing Kurdish fighters in northern Syria.;
With airstrikes and artillery, Turkey has launched an offensive aimed at crushing Kurdish fighters in northern Syria.;

In a series of tweets Monday, Trump explained that pulling U.S. forces out of Syria would not weaken U.S. security and credibility. 

“Anyone who wants to assist Syria in protecting the Kurds is good with me, whether it is Russia, China, or Napoleon Bonaparte,” he wrote. “I hope they all do great, we are 7,000 miles away!”

Trump has dug in on his decision to pull out the troops, believing it fulfills a key campaign promise and will be a winning issue in the 2020 election, according to White House officials.

A Turkish military convoy carrying tanks and additional soldiers crossed into Syria Monday. Syrian troops, meanwhile, entered several northern towns and villages near the border as Turkey's army marched south, raising concerns of clashes. (Oct. 14)
A Turkish military convoy carrying tanks and additional soldiers crossed into Syria Monday. Syrian troops, meanwhile, entered several northern towns and villages near the border as Turkey’s army marched south, raising concerns of clashes. (Oct. 14)

Trump got quick support from Republican Sen. Lindsey Graham of South Carolina, who earlier had lambasted his withdrawal decision as “shortsighted,” ”irresponsible” and “unnerving to its core.” Graham said he was asked to join the president and his team for phone calls with the key leaders in the conflict.

“President Trump made it clear to President Erdogan this incursion is widely unpopular in the United States, greatly destabilizing to the region, is putting in jeopardy our successes against ISIS, and will eventually benefit Iran,” Graham said.

The Kurds have turned to the Syrian government and Russia for military assistance, further complicating the battlefield.

The prospect of enhancing the Syrian government’s position on the battlefield and inviting Russia to get more directly involved is seen by Trump’s critics as a major mistake. But he tweeted that it shouldn’t matter.

“Others may want to come in and fight for one side or the other,” he wrote. “Let them!”