The best reponse by the West would be a series of simultaneous symmetrical military campaigns and asymmetrical espionage and sabotage to bleed and freeze Russia, and strangle China.
South Korea and Japan have interest to weaken China's influence in North Korea.
Taiwan, Phillipines, Vietnam, Malaysia, Brunei, and Indonesia have interest to weaken China's regional influence in the South China Sea.
India has interest to weaken China's influence in Tibet and along their border.
The former Central Asian Soviet Republics have interest to weaken China's influence over East Turkestan and China's Belt and Road initiative.
Sri Lanka, Dijbouti, and Kenya have interest to retake infrastructure taken by China when they defaulted in debt.
Hong Kong wants its independence from China.
Taiwan wants to maintain its independence from China.
NATO would have interest to blockade Russia in the Black Sea, the Baltic Sea, and the White Sea.
Australia, New Zealand, and Japan (SEATO?) would have interest to blockade Vladivistok.
Taiwan, Japan, and South Korea would have interest to blockade the East China Sea.
Finnish nationalists might have interest to take back Karelia, Salla, Petsamo, and Vyborg.
Norwegain nationalists might have interest to re-assert their interests in the Artic Ocean.
Estonia, Latvia, Lithuania, Poland, Germany, and Ukraine nationalists may have interest to reduce Russia's influence in Belarus and Kaliningrad.
Georgian nationalists would have interest in retaking territory seized by Russia.
Romanian nationalists would have interest in re-intergrating Moldava.
Many Nations' financial authorities may have interest in confiscating Russian wealth in Cypriot banks.
China and Russia plan on dividing and conquering their targets one-at-a-time. If their targets respond simultaneously symmetrically and asymmetrically, Russia and China may be overwhelmed.
China, Russia, and Belarus would need to dealt with simultaneously. Russia would use the distraction of Chinese agression in the South China Sea to act against Ukraine and the Baltics. China would use the distraction of Russian agression to make moves in the South China Sea, Taiwan, and India.
The removal of Belarus from the Russian sphere of influence would further weaken Putin's position in Russia.
... something reminiscent of Abraham Lincoln's Anaconda Strategy against the Confederacy during the Civil War.
