No group has claimed the four activists' abduction and they have not been heard from since.
Ankara-backed rebels played a key role in supporting Sharaa's Islamist group Hayat Tahrir al-Sham (HTS), which headed a rebel alliance that seized Damascus on December 8, toppling longtime ruler Bashar al-Assad.
The seismic change in Syria is expected to yield deeper Turkish sway just as a change of US administration is raising questions over how long Washington will keep backing the country's Kurdish-led forces.
Assad fled Syria following a lightning offensive spearheaded by the Islamist Hayat Tahrir al-Sham (HTS), more than 13 years after his crackdown on democracy protests precipitated one of the deadliest wars of the century.
Darwish was detained for months by one of the most feared branches of the former government's many-tentacled intelligence services.
Syrians will not miss Assad, a brutal ruler who failed his people.
The offensive, which took just 10 days to sweep across Syria and take the capital Damascus, stunned the world and brought an end to more than a half a century of brutal rule by the Assad clan.
"We would like to see the situation in the country stabilised somehow as soon as possible," Kremlin spokesman Dmitry Peskov told reporters.
"Their human capital, their experience will allow the country to flourish," Bashir said in an interview published Wednesday.
Three people have been arrested in Libya on suspicion of involvement in launching a boat packed with migrants.
The UN says "much more is required" to prevent the deaths of migrants fleeing to Europe after hundreds were reported dead in recent days.
A Virginia teenager is set to be sentenced for helping another teen travel to Syria to join the Islamic State and providing other aid to the militant group.
People around the world are living longer, but many are also living sicker lives for longer, according to a study.
But it does not need Economist Intelligence Unit’s ranking for anybody to know that Dhaka has been rotting, stinking and becoming more terrible to live in every year.
Ayoub El Khazzani is said to have told investigators he is "dumbfounded" by accusations he was intending to carry out a terror attack, and insists he was only trying to rob passengers.
Islamic State militants have destroyed Palmyra's ancient temple of Baalshamin, Syrian officials and activists say.
The Italian navy organizes the rescue of around 4,400 migrants in waters off the Libyan coast, prompted by requests for help received from nearly two dozen boats, in one of the biggest multi-national operations so far.
Authorities interrogate a suspected jihadist gunman who was overpowered by passengers on a packed Amsterdam-Paris train, as officials say he had visited Syria and was known to intelligence services
Globalisation is supposed to tear down barriers, but security fears and a widespread refusal to help migrants and refugees have fuelled a new spate of wall-building across the world, even if experts doubt their long-term effectiveness.
