UNHCR spokeswoman Ariane Rummery says a United Nations team met Monday with Jordanian border authorities and community leaders to discuss "distribution modalities" for the ration plan.
The camp the jets hit is home to a few hundred Syrians, mostly women and children.
The Russian Defence Ministry was not immediately available for comment. Before the attack, Jordan had allowed in only about 50 to 100 refugees daily from Rukban and another camp at Hadalat.
Western officials said they were still gathering information on the incident, but said they'd heard it was the Russians who launched the strike.
Their backing is part of a strategy of ensuring opposition-held southern Syria does not fall into the hands of radical jihadist groups such as al Qaeda's Nusra and Islamic State.
GETTYVladimir Putin has been bombing Syria in support of President Bashar al-Assad
The raid wounded at least 40 more Syrians, Reuters reported.
A medical source, however, said four people were injured and hospitalized in northeastern Jordan.
Khalil Ashawi/Reuters The Kremlin's major aerial bombing campaign started last September in support of Syrian President Bashar al Assad against insurgents battling to topple his rule.
The camps with a population of at least 60,000 people fleeing from central and eastern Syria have been stranded for months in a desolate strip close to where the borders of Iraq, Syria and Jordan meet. Jordanian officials have refused to allow these people entry, citing security fears.
Jordan closed the border to both would-be refugees and aid agencies after a June 21 suicide bombing claimed by Daesh (the so-called IS) group killed seven soldiers near the makeshift desert camp. The refugees are "enduring very harsh weather conditions, sweltering heat and frequent dust storms" and "have or are running out of food", WFP Jordan spokeswoman Shaza Moghraby said late last month.