Russia’s Defence Ministry handout photo shows Sukhoi Su-25 fighter jets taking off from Hmeymim air base near Latakia, Syria.

Russia has told the United Nations on Monday it was “outraged” by allegations that it had killed civilians in Syria and destroyed civilian infrastructure as a U.S.-based rights group accused Moscow’s air force of bombing 10 medical facilities in October.

Russia launched air strikes in Syria to help bolster forces loyal to President Bashar al-Assad at the end of September, but Western powers accuse Moscow of targeting anti-Assad rebels instead of Islamic State of Iraq and Syria (ISIS) militants. A U.S.-led coalition has been bombing ISIS in Syria and Iraq for more than year.

Physicians for Human Rights said there had been 16 attacks on medical facilities in Syria in October, the worst toll since the civil war began nearly five years ago. It blamed at least 10 of those attacks and one death on Russian air strikes.

“We are outraged by different types of information regarding alleged civilian deaths and destruction of civilian infrastructure as a result of missile and air strikes by the Russian armed forces,” Russian Deputy U.N. Ambassador Vladimir Safronkov told a U.N. Security Council meeting on Syria.

Citing recent meetings of an International Syria Support Group in Vienna that aims to end the conflict, he dubbed unacceptable what he called “the politicization of human rights and humanitarian topics.”

Without laying any blame, U.N. aid chief Stephen O’Brien told the Security Council that attacks on civilian infrastructure continued unabated.

“We need a firm commitment from the parties to the conflict to take all necessary measures to protect civilians and stop the targeting of civilian infrastructure, including medical facilities, schools and key infrastructure networks,” he said.

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