Russian President Vladimir Putin delivers a speech on the opening day of the World Climate Change Conference 2015 (COP21) at Le Bourget, near Paris, Nov. 30, 2015. Reuters

Russian President Vladimir Putin claimed Monday that last week's downing of a Russian Su-24 warplane near Syria by the Turkish air force was intended to protect oil deliveries from the Islamic State group. Discussing the matter during the Paris climate change summit, he said Moscow intelligence confirmed that oil from fields controlled by the terrorist organization is transported to Turkey, Sputnik News reported.

“At the moment we have received additional information confirming that oil from the deposits controlled by Islamic State militants enters Turkish territory on industrial scale,” Putin said. "We have every reason to believe that the decision to shoot down our aircraft was dictated by the desire to ensure the safety of supply routes of oil to Turkey, to the ports where they are shipped in tankers.

Turkish President Recep Tayyip Erdogan was also in attendance at the Paris climate change talks and denied Putin's accusations, saying that the country does not cooperate with the group, aka ISIS. Erdogan said the countries from which Turkey imports oil are "well-known."

“We are not that dishonest as to buy oil from terrorists," Erdogan told the Telegraph Agency of the Soviet Union. "If it is proven that we have, in fact, done so, I will leave office. If there is any evidence, let them present it; we’ll consider [it]."

Iraqi former National Security Adviser Mowaffak al Rubaie accused Turkey Sunday of there being more than $800 million worth of oil purchases on the black market in the country.

"This is Iraqi oil and Syrian oil, carried by trucks from Iraq, from Syria, through the borders to Turkey and sold ... [at] less than 50 percent of the international oil price,” al Rubaie told RT News.

While at the conference, Putin reiterated his belief that it was not necessary for Turkish air force to shoot down the jet Nov. 24. He also acknowledged the faulty relationship between the two countries.

"Problems do exist, and they emerged a long time ago, and we have been trying to resolve them in dialogue with our Turkish partners,” he told RT News.

No steps were taken Monday to resolve matters between the countries; Putin confirmed the two leaders did not meet privately.

World leaders are gathered near Paris for a series of talks between 195 countries regarding climate change. The summit will run until Dec. 11.