I'm more concerned about Chinese than the Russians. The Chinese seem to be buying everything the Russians is willing to sell. The Chinese feel they have unjustly been denied their right as a world power. Even the word for China "Zhong Gua" translates to "Middle Country".
The Russians are no longer trying to expand their boarders by military conquest. China has claimed ownership of the South China Sea, Sparley Islands, and Taiwan. China continously acts like a jerk whenever someone "hurts their feelings".
The biggest concern about China is that they view the United States as their biggest enemy at the same time that China is becoming an economic power.
China is a greater threat because they have the economic power that the Russians don't. Their often contentious posture toward the US causes additional concern. I'm surprised there hasn't been new sabre rattling towards Taiwan during the Afghan operation.