Russian President Vladimir Putin says protecting oil is why Turkey show down a Russian jet last week, as the nation refuse to issue an apology for an attack.

Mr Putin, speaking at the global climate conference in Paris on Monday, said the decision to shoot down the plane was a “huge mistake” and that he had not met Turkish President Tayyip Erdogan, despite them both being in Paris.

“We have received additional data which confirm that Islamic State oil … enters the territory of Turkey,” Putin said.

“The decision to shoot down the plane was dictated specifically by a desire to defend supplies.”

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Mr Erdogan called claims that Turkey buys oil from Islamic State “slander”.

Six days after NATO member Turkey shot down the Russian fighter jet in the first known incident of its kind since the Cold War, calls for calm have gone largely unheeded as Ankara refuses to back down and Russia responds with sanctions.

“No country should ask us to apologise,” Prime Minister Ahmet Davutoglu told reporters on Monday following a meeting with NATO’s secretary general at the alliance headquarters in Brussels.

“The protection of our land borders, our airspace, is not only a right, it is a duty,” he said.

“We apologise for committing mistakes, not for doing our duty.”

Mr Putin said on November 26 he was waiting for an apology after Turkey’s air force shot down the Su-24 fighter jet along the Turkey-Syria border.

Following the meeting with NATO chief Jens Stoltenberg in which he won the alliance’s firm support for the right to self-defence, Mr Davutoglu also warned that such incidents continued to be a risk as long as Russia and the US-led coalition bombing Islamic State in Syria worked separately.

“If there are two coalitions functioning in the same airspace against ISIL, these types of incidents will be difficult to prevent,” Mr Davutoglu said, referring to Islamic State militants.

Moscow’s surprise intervention in the four-year-old Syrian civil war in September wrong-footed the West and put Turkey, which shares a long border with Syria, directly at odds with Russian support for the Assad regime there.

The downing of the Russian warplane has wrecked both Turkish-Russian relations and the French-led diplomatic effort to bring Moscow closer into the fold of nations seeking to destroy Islamic State through military action in Syria.

On Monday, Russia said the ban would be mainly of agricultural products and it might expand the sanctions if needed.