US Vice President Mike Pence traveled to Ankara on Wednesday along with Secretary of State Mike Pompeo and other delegates to try and negotiate a settlement to the conflict. Pence will also reiterate the US' commitment to reaching an immediate ceasefire.
Russia has said it will not allow clashes between Turkish and Syrian forces, as Turkey's military offensive in northern Syria continues.
The US has imposed sanctions on Turkish ministries and senior government officials in response to the country's military offensive in northern Syria.
Syria's army has started to reach the north of the country, hours after the government agreed to help Kurdish forces facing Turkey.
Spain's Supreme Court has sentenced nine Catalan separatist leaders to between nine and 13 years in prison for sedition over their role in the 2017 independence referendum.
More than 110,000 people are taking part in search and rescue operations after Typhoon Hagibis struck Japan on Saturday.
Russia's unmanned Luna-25 spacecraft has crashed into the Moon after spinning out of control, officials say.
Donald Trump has confirmed that he will not take part in Republican presidential debates with his rivals in the race for the White House.