An emergency debate on Syria is due to be held at the UN Human Rights Council in Geneva on Wednesday.
Member states will consider a resolution condemning the presence of foreign fighters in Qusair, as fighting around the strategic town intensifies.
Foreign powers have been in dispute over the question of arming the warring parties in Syria.
The row has overshadowed a US-Russian effort to arrange a conference to seek an end to the two-year conflict.
The drive is also being undermined by the failure so far of Syrian rebels to agree who should represent them at any such conference.
The UN’s top rights body will on Wednesday debate a draft resolution condemning the Syrian government’s use of “foreign combatants” in the besieged town of Qusair.
UN human rights commissioner Navi Pillay has warned that the violence has reached “horrific dimensions”, and the resolution before member states calls for immediate access for UN aid agencies.
The fact that Qatar – along with the US and Turkey – drafted the resolution reflects the deep divisions over Syria, says the BBC’s Imogen Foulkes in Geneva.
The “foreign combatants” are implied to be Hezbollah from Lebanon, who support the Syrian government – while Qatar is widely believed to be supporting opposition forces, some of them also foreign.
If there is one thing the Human Rights Council hopes to achieve, our correspondent says, it is a pause in the fighting around Qusair, where thousands of civilians are thought to be trapped.
But the council’s decisions are not binding – only the UN Security Council can order sanctions or peacekeepers, and those options look as far away as ever, she adds.
Separately, representatives from 40 countries as well as some “special guests” are expected to attend a Friends of Syria meeting in the Iranian capital, Tehran, Iranian officials were quoted as saying in local media.
{BBC}
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