There are only 3 great powers in this world

[ST1976]

US is the sole Super Power of the world in true sense.
You attack any American ally and you will have Americans fighting with their whole might against you.
Russia,China and India have very little true-alliance building behaviour.They are mostly business oriented dealers.
They will never be able to compete US when it comes to building alliances.
And alliance is what that builds a solid block to set a world order.

China despite its military might is afraid to come out of its shell and build alliance with anti-US countries and challenge the US hegemony.
Russia is simply exhausted now.
India's approach is always careful.
They will never take risk
Typical Subcontinental behaviour.

Chinese are old buddies thanks to their one child Policy.they can't expend their men to build their influence on the world.

Russia is a giant gas station owned by oligarchs.

Russia military innovation has been close to zero post Cold War.

Russian military industrial base has been declining slowly

Educated Russians have been migrating. The population is stagnant.

we find India-Russia combined power increased consistently since 1990

here its worth saying India's relation with China, deeper than ocean and higher than sky.
and this is brics. its China, (and also Russia-Iran-Iraq), with whom India has relation, deeper than ocean and higher than sky

 

[ChineseTiger1986]

Obama said years ago Russia is a regional power. Still valid. Ukraine has decimated much of Russia military potentials. Russia market in Europe is dead. Putin can only sell oil and gas cheap and cheaper to China and India, at much lower prices than he previously sold to Europe.

Russia has its own aerospace industry and space program, and confront the entire NATO alone.

It is still a superpower albeit being weakened.

 

[nahtanbob]

Russia has its own aerospace industry and space program, and confront the entire NATO alone.

more like fighting Ukraine backed by NATO

 

[delta2]

The USA is a super power and an empire, although in decline.

China is a superpower already and an empire in the making.

Russia is a superpower, used to be an empire. Can still track, target and destroy ever single USN submarine. The USA-Russia M.A.D. doctrine still applies.

There is no fourth on the list.