A complaint has been filed against Russia at the UN, accusing the Russian air force of deliberately attacking a hospital in opposition-held northern Syria five years ago.
It is being brought by a Syrian man, backed by human rights groups, whose relatives were killed in the attack.
Russia launched an air campaign in support of Syria's government in 2015 that helped turn the tide of civil war.
It has repeatedly denied that Russian forces have deliberately targeted hospitals.
The UN’s own investigation into the conflict has documented widespread possible war crimes, including indiscriminate bombing by Russian and Syrian forces.
But so far, apart from a handful of cases in Europe against Syrian asylum seekers alleged to be former members of the Syrian military or its intelligence services, there has been little accountability.
