BORIS Johnson has slammed Russia for blitzing an aid convoy in Syria after a UN inquiry blamed a Kremlin jet.

The devastating strike close to Aleppo killed 10 aid workers and took out 17 trucks, destroying vitally needed supplies for 78,000 people.

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The attack in September was seen as one of the worst atrocities of the five year-long war.

A three month probe by the UN yesterday found three Syrian regime helicopter gunships lead the onslaught, followed up by Assad and Russian jets.

Mr Johnson branded the killings “indefensible”.

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The Foreign Secretary added: “This was one of the most appalling incidents of the conflict so far.

“Over half a million Syrians are still in areas besieged by the regime - many have received no aid since June.

“The regime and its backers must comply with their obligations, including the recently adopted UN Security Council Resolution 2328, to allow the UN unconditional, safe and unhindered access across Syria.”

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The long convoy was fired on while delivering aid to a Syrian Arab Red Crescent compound near Urem al-Kubra, west of Aleppo, on September 19.

But the UN report – released by Secretary-General Ban Ki-moon – said it did not have enough evidence to declare the attack a blunder or on purpose.