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.
Access for agenciesThe 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.
"Start Quote
End QuoteThe sabre-rattling is growing louder, and the West is making fierce faces at Bashar al-Assad"
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.
Analysis
While lifting the EU arms embargo is theoretically good news for the fractious Syrian opposition, it is clearly going to be some time before it has any effect on the battlefield balance. Its authors hope the decision will send a strong enough signal to the Assad regime that it is time to hand over power. That is extremely unlikely. It is hard facts on the ground that count for a regime that has shown determination to fight to the end to stay in power.
While European arms supplies remain for the moment theoretical, the step has stirred an angry reaction - possibly even an escalation - from the Russians. They've said the move jeopardises efforts to convene a peace conference, and that they plan to honour a prior contract to supply Syria with advanced S-300 air defence missiles. Israel sees that as a threat to its own security, and has warned that it "would know what to do".
The stakes are clearly getting higher. But for the rebels, at least the eventual possibility of carefully-controlled arms deliveries is there, in what looks like being a bloody, long-haul struggle.
The meetings come amid fresh international tensions over the Syrian conflict following an EU decision not to renew an arms embargo on Syria - a position Washington has backed.
Though EU ministers said there were no immediate plans to arm rebels in Syria, the UK Foreign Secretary William Hague has insisted there is nothing to stop nations doing so before a 1 August EU review of the situation in the country.
In response, Russia - a key ally of Syrian President Bashar al-Assad - said it would go ahead with deliveries of S-300 anti-aircraft missiles to Syria, and that the arms would help deter foreign intervention.
The S-300 is a highly capable surface-to-air missile system that, as well as targeting aircraft, has the capacity to engage ballistic missiles.
This has in turn provoked the ire of Israel, which fears the weapons could end up in the hands of its enemy Hezbollah.
Israel has said it would intervene to stop this, and is widely believed to have already carried out strikes on arms convoys in Syria.
Israeli Defence Minister Moshe Yaalon said the Russian missile systems had not yet left Russia, but added: "I hope they will not leave, and if, God forbid, they reach Syria, we will know what to do."
Commander's warningAs the diplomatic sparring intensifies the warring sides in Syria continue to try to gain the upper hand.
Though not long ago the rebels seemed to have the advantage, in recent weeks government forces have won a number of battlefield victories that may make Damascus less inclined to negotiate, say correspondents.
Gen Salim Idris - military chief of the main umbrella group of Syrian rebel forces, the Free Syrian Army - told Associated Press he was "very disappointed" at the EU's apparent decision not to send weapons to his forces immediately.
Amid the diplomacy, opposition activists told the BBC they had documented the deaths of more than 200 people in a massacre earlier this month
He cautioned his fighters could lose control of Qusair - strategically placed close to Syria's border with Lebanon - if weapons did not arrive quickly.
Correspondents say the US and European backers of Syrian rebels have baulked at sending heavy weaponry in fear they could end up in the hands of Islamic militants, some linked to al-Qaeda.
But the loss of Qusair could, they say, further buoy the Syrian government and set back the prospect of a negotiated transition which many rebels insist must not include President Assad.
Despite meeting in Istanbul for six days of talks, rebels have failed to agree on who should represent them at the planned peace conference, which Washington and Moscow had hoped to convene in Geneva in June.
29 May, 2013
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