Russia have resources but poorly utilize them. China offers expertise and technology. You two marry your economies. Then Russia holds the nuclear gun to your head.
Every indication shows China actually feels no threats from either Russia or North Korea even when those 2 have nuclear weapons.
BTW regarding trades, as officially stated there will be no sanctions coming from China. Without the dollars, China will work with Russia in the same way that they have been working with Iran for so many years.
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