I’m confused... That is what is being paid for Ural Oil. The chart even gives the comparison to other oil. Recent article from Bloomberg states India was paying $64 a barrel recently. The most discounted price I’m reading is roughly $50 a barrel. A far cry from $30.
I can’t help you with charts - but they are numerous people who have recited that number including in official Russian publications.
No more please, this is boring.