The State Department told Newsweek that a new Turkish attack "would further undermine regional stability," while Russia said such a move "may raise tensions in Syria's north."
At least two Russian operators are providing tourists with the chance to visit Syria in an itinerary that starts from the Lebanese capital, Beirut.
Evan McMullin, a former CIA officer turned Republican policy chief, criticized Trump after Russian forces were seen touching down in Qamishli, northern Syria.
"We have concluded that the real intention of ISIS is to begin a mission they're calling 'break down the fences,'" Iraq's Lieutenant General Saad al-Allaq said.
President Donald Trump has consistently argued in favor of ending Middle East wars, while holding on to foreign oil assets— feeding into longstanding criticism about the intention of U.S. intervention.
President Donald Trump has said a force of Americans will remain in the east of the country to guard the oil fields there.
"They said he had committed suicide in jail. However, he was killed because he knew a lot of vital secrets connected with very important people in the British and American regimes," Syrian President Bashar al-Assad said.
The base's commander said the "aviation commandant's office" will allow Russian helicopters to support patrols in the Turkish border region.
The 20th century genocide killed more than 1 million people, and the Turkish government still denies it occurred.
Five Syrian refugees, all torture survivors, have filed witness statements on what they endured in their home country and asked Norwegian officials to investigate the war crimes they experienced.
Newsweek is evaluating President Donald Trump's statements made after meetings with Turkish President Recep Tayyip Erdogan amid strained relations over the renewed violence in northeastern Syria.
To keep Russia and Iran in check, NATO now more than ever needs to develop and pursue a comprehensive strategy for the Black Sea. Georgia is key to the region.
The critics of Trump's foreign policy decisions are not offering any new solutions to the complex problems that America faces.
General Mazloum Kobani said the Turkish invasion of northeastern Syria has opened up new opportunities for ISIS remnants.
Erdogan complained Tuesday that neither the U.S. nor Russia has been able to "clean" the Kudish-led forces out of Turkey's invasion zone.
"We don't know these people particularly well," a senior State Department official said of Syrian rebel groups accused of atrocities, adding that the U.S. was "asking the Turks to chase them down."
Baha Abu Al-Atta, a top commander for the Islamic Jihad organization, was killed alongside his wife on Tuesday in an Israel airstrike.
The U.S. is set to deploy some 600 soldiers to guard eastern Syria's oil fields against Islamic State remnants, though Trump has said he wants to bring in a U.S. company to develop the resources.
Assad's forces have used tactics including indiscriminate bombing, chemical weapons and mass disappearances in their effort to bring all of Syria back under the dictator's control.
Syrian Democratic Forces commander says his group "should be part of the general administration of Syria, within the constitution" and must have "its own exclusivity within Syria's general system of protection."
Discussing ISIS' new head, a senior State Department official said that "we intend to subject him and any other ISIS leader to unrelenting pressure, using all the tools at our disposal."
A day after Turkey's Recep Tayyip Erdogan confirmed reports that Abu Bakr al-Baghdadi's wife, sister and brother-in-law were detained, he said a DNA test proved one of his children was in custody as well.
The International Institute for Strategic Studies said Tehran has established a regional network of some 200,000 fighters.
The former ambassador to the United Nations has written a book about her time in the White House called "The Education of an Idealist."
The Turkish Defense Ministry announced that up to seven Kurdish PKK fighters were killed in back-to-back strikes in northern Iraq as deadly clashes continued across the border in Syria.
"At a time when ISIS was crumbling, its leader naturally headed to the spot with the most terrorist sympathizers for him to stay alive," Northeastern University's Max Abrahms told Newsweek.
Rivals U.S. and Iran both support Iraqi Prime Minister Adel Abdul-Mahdi—but he's under increasing pressure to step down amid widespread protests that could put US troops at risk
Foreign ministry spokesperson Maria Zakharova said the international community had the right to question the U.S. policy.
The dictator suggested Trump's transactional foreign policy is illustrative of America's global approach.
The new ISIS caliph is Abu Ibrahim al-Qurayshi and its spokesperson is Abu Hamza al-Qurashi