It isn't a sovereign country and hasn't been since 2014 so your question fails on it's assertions.

But since Kyiv existed before Moscow...

What is your argument for this claim?

It's obvious that they manage and the economy did NOT collapse. Have you ever bothered to check Russian national debt and their gold reserves? Not even talking about all commodity / mineral reserves that are still in the ground.

Life simply goes on in Russia and life is much cheaper in that part of the world anyways and all trade with the West is halted.

The fact that Ukraine has been in civil war since the illegal coup against a democratically elected government.

It's completely logical that when a war starts (or some other major disruption), people hang on to their money. Plenty examples available.

Irrelevant. The sun existed before the Earth too, since we're now changing the subject.

And if one accepts your assessment, you're arguing that a country in an active civil war is not a sovereign country?

Ukraine declared Independence in 1991, and such independence was recognized by Russia's Boris Yeltsin that same year.

How can a nation divided in civil war be sovereign? Do you know the international laws on sovereignty?

I'm happy to learn something new, but even if one considers the War in Donbas to be indicative of "a nation divided in civil war", it doesn't mute Ukraine's independence and sovereignty outside of that region. And further, I don't see how one can hope Russia wins this war given that Russia is not simply seeking to capture and secure the Donbas region, but is targeting the whole of Ukraine.