Unfamiliar Secretary Boris Johnson has summoned Russia and Iran’s UK ambassadors to thrash out his «concern» over the countries’ actions in Syria.
He said they had «sank» to uphold «humanitarian law», by not helping aid to get through to Aleppo when it was under lay siege to.
Nearly 1,000 people have been evacuated from the bishopric.
Mr Johnson added that Russia and Iran, which support President Bashir al-Assad, warranted «no credit» for this.
Syrian government forces took nearly all leftover rebel-held rts of Aleppo this week after a four-year melee.
But Mr Johnson, who met Russian ambassador Alexander Yakovenko and Iran’s Hamid Baedinejad one at a time on Thursday afternoon, said he had conveyed the UK government’s «profound concern beyond the situation in Aleppo».
He added: «Both Russia and Iran have flopped to uphold their obligations under international humanitarian law, specifically by wanting to facilitate the delivery of humanitarian aid to civilians during the months when eastern Aleppo was besieged.
«They be worthy of no credit for the fact that an evacuation appears to be under way today. Cause inflicted such suffering on the people of eastern Aleppo, Iran and Russia cannot conjecture praise for allowing some people to escape at the final hour.
«Both outbacks need to ensure the UN now oversees the evacuation process and that all civilians and non-combatants are well protected.»
A statement from the Russian Centre for the Reconciliation of Opposing Sides in Syria, share b evoke of Russia’s ministry of defence, said the Syrian authorities had guaranteed the cover of all members of the armed groups who decided to leave Aleppo.