The United Nations Security Council has convened at the behest of the Russians after dozens of Syrian soldiers were accidentally killed in a US coalition bombing raid.
It met within hours of the Obama administration expressing its regret at the strikes on Jabal Therdeh, southwest of the Deir Ezzor airport in eastern Syria.
According to Russian estimates 62 soldiers were killed in in the strikes, which the US said were aimed at the Islamic State of Iraq and the Levant.
The Syrian Observatory for Human Rights monitoring group said at least 83 soldiers lost their lives in the attacks.
The raid took place within days of an agreement between Russia and America to co-operate in Syria and co-ordinate their efforts against Isil, following talks between John Kerry, the US Secretary of State and his Russian counterpart, Sergey Lavrov.
It was an agreement intended to broker a truce and bring relief to the stricken population, while limiting fighting to those areas under the control of Isil.