Today, Russia is more of a junior partner in its relationship with China.How much seriously USA has taken Russia and how much seriously they are taking china..... They are constantly sitting in South China sea breaking china maritime boundary, air violations with even P8 posidon, forming quad..... If push comes to a show china will be like a landlocked country and still able to do nothing about it.... Endless arguments.... But china will be winner on pdf offcourse...
Overtime, Russian power will decline further as its economy is not likely to succeed a lot.
China's military is constantly improving with huge budget allocation due to improving economy.
US may be able to make China behave for sometime, but only if it plays smartly and makes only one enemy. No need for it to be enemy with Russia too. Russia + China can break the gridlock which US sets.