There is no evidence to suggest that North Korea has provided oil or military support to Russia in its war against Ukraine. The article you’re referring to does not mention oil as payment for weapons and troops sent to Moscow.
However, there are reports of North Korean soldiers being deployed to Kursk Oblast in Russia’s western border with Ukraine, but the numbers seem to be lower than initially reported (around 11,000, according to Commander-in-Chief Oleksandr Syrskyi). These reports suggest that North Korea is participating in the conflict as a Russian ally.