The UK is working with international partners to draw up a new United Nations security council (UNSC) resolution on Syria in response to the deteriorating humanitarian situation.
Foreign Secretary William Hague said there was a "compelling" case for the UNSC to take a fresh look at the issue following the "barrel bomb" attack on Aleppo.
He condemned the "grotesque and utterly unacceptable" situation in Homs and other besieged areas, where president Bashar Assad's regime have been accused of trying to starve the population into submission.
The Foreign Office confirmed that efforts to bring the issue back for discussion by the UNSC had begun.
"We are working with partners on a text which we hope to present later this week," the spokesman said.
Speaking after a meeting with German counterpart Frank-Walter Steinmeier, Mr Hague said: " I deplore the reported killing of over 80 people in Aleppo this weekend, by the regime deliberately unleashing barrel bombs on the civilian population.
"It comes on top of the deliberate starvation of civilians in Homs and other besieged areas, which is grotesque and utterly unacceptable.
"The United Kingdom also believes that there is a compelling case for bringing the humanitarian situation back under discussion in the security council. I have discussed with the (German) foreign minister today this and other steps to ensure that aid reaches all those in Syria who need it.
"Both our countries are making a strong practical contribution to the destruction of Syria's chemical arsenal. We call on the Russian government to urge the regime to accelerate the work to deal with its chemical weapons and related material.
"And we will continue to work together in support of the Geneva II process - including the full participation for Syrian women, which we have long called for."