Might have to do with reaffirmation.
China was upset with the "Arab Spring" situation that developed and sunk the oil futures China had just negotiated with Libya. Russia was distracted by the same "Arab Spring", and has just completed a pipeline and oil deal with China that will take two years to get fully operational. This may be the reaffirmation of that trade agreement before "Arab Spring" and the new deals.
It gets worse for the Russians when in five years they figure out that the whole world including china is shifting over to alternatively fueled vehicles.