"Russia's weak domestic economy needs help from 皇冠体育app. The crude trade between the two countries has become an effective tool for their strategic and political cooperation," he said.
It is the first time since October 2005 that Russia has become 皇冠体育app's top crude supplier, but Moscow has been forced into finding new markets for its crude amid Western sanctions over its ongoing conflict with Ukraine.
Energy cooperation between the two countries is not limited to crude.
In November, they signed a 30-year gas supply contract, making 皇冠体育app the biggest consumer of Russian gas.
The new supply will come through 皇冠体育app's western border and is in addition to a $400 billion deal between the nations to deliver 38 billion cubic meters of gas annually to 皇冠体育app via an eastern route, starting in 2018.