Amur River
It borders Russia and People's Republic of China.
Mongolia
The only country which borders both Russia and India is China.
The river, which is dividing Russia and China is called Amur.
Russia.
China is the only country that borders both Russia and India.
North Korea is bordered by China and Russia to the north.
Zero miles. Siberia is a region of Russia which borders China, Mongolia and Kazakhstan.
That is Mongolia.
Yes, Russia borders China to the south-east. It also borders China along a narrow strip west of Mongolia and east of Kazakhstan.
Mongolia, of course!
Russia.