The German Chancellor will discuss the situation in east Ukraine.
In Kazakhstan, the rebels have only interacted with the Syrian regime via intermediaries.
Ahead of peace talks, rebels' representative says it's a 'real test of the power of Russia' to hold off Iran and the Syrian government.
Residents are coming back to see the damage despite the U.N. urging people not to return.
Putin said the Syrian government and opposition have signed a number of documents.
The girl became famous during the siege of Aleppo for her dispatches from the city.
The evacuation of Aleppo brokered by Russia and Turkey was suspended on Friday.
Assad also cast doubt on whether Trump's campaign rhetoric will become reality.
Russia said the International Red Cross will help transport injured rebels out of the city.
A ceasefire agreement was reached after reports of summary executions in the city.
The Syrian military, backed by Russia, is on the brink of recapturing the northern city.
Foreign Minister Jean-Marc Ayrault says the "humanitarian disaster" in Aleppo must end.
The loss of territory in Aleppo is the biggest defeat for rebels in the city since 2012.
Civilian volunteers say the lack of medical supplies and aid will leave many facing death.
A facility in the rebel-held Syrian village of Awaijel, west of Aleppo, was destroyed.