Russia warned of a "rapidly deteriorating" situation in eastern Syria where U.S.-backed Kurds are struggling to defeat ISIS.
Turkey gives its first official account of the journalist's disappearance.
Russia's alliance with Turkey is being tested by the ongoing presence of militant groups in Idlib and attacks on Syrian Kurds in the north.
Erdogan said Turkey had more information than it had shared so far about the killing of journalist Jamal Khashoggi.
Erdogan knows that knows that in the Khashoggi affair, time is very much on his side.
"It's very simple," the president said. "Bad deal. It should have never been thought of."
The chancellor said there was an "urgent need for further clarification" of the circumstances surrounding Jamal Khashoggi's killing.
"You don't bring a bone saw to an accidental fistfight," Senator Ben Sasse said Sunday.
The latest account, provided by a Saudi official who requested anonymity, includes details on how the team of 15 Saudi nationals sent to confront Khashoggi.
The report suggested Albostani "could have been silenced."
Iran has not officially weighed in on the case of missing journalist Jamal Khashoggi, but it has criticized U.S. support for Saudi Arabia.
Riyadh's state-run Al Ekhbariya outlet reported that 18 Saudi citizens have been arrested in connection with the death of Jamal Khashoggi.
While U.S. Treasury Secretary Steven Mnuchin canceled one trip to Saudi Arabia, he's reportedly still scheduled to attend another event in Riyadh.
King Salman entrusted his son with running Saudi Arabia, but that may change with mounting evidence that the crown prince was involved in the death of a journalist.
"The Democrats seriously believe they have a way of blaming Donald Trump for this," Limbaugh said.
With the Saudi monarchy still not prepared to tell the world what happened to Jamal Khashoggi, America must act decisively.
Senior State Department official Heather Nauert posted an Instagram photo of her smiling, captioned "#SaudiArabia at The Royal Court."
"This week [they are] a brigade working for a friendly organization, next week they've joined up with one or another terrorist organization," the U.S. special envoy to Syria said.
The top diplomat had been dispatched by President Donald Trump to Saudi Arabia in the wake of dissident journalist Jamal Khashoggi's alleged murder.
Prince Khalid, accompanied by Saudi Foreign Minister Adel al-Jubeir, met Secretary of State Mike Pompeo upon arrival in Riyadh on Tuesday.
Tensions are high between Riyadh and the West over allegations that the journalist was murdered in the Saudi Consulate in Istanbul.
President Donald Trump has refused to put at risk the United States' lucrative arms sales to Saudi Arabia.
Spreading fake news in Saudi Arabia could land you up to five years in prison, along with a fine of nearly $800,000.
The Turkish government voted to rename the street on which a future U.S. embassy will sit after American civil rights leader Malcolm X.
The deals may be in jeopardy after local challenges emerged to two precarious international arrangements designed to avoid new violence.