It is easy, just not all people know about it. Rule is simple - not be tax resident and spend < 6 months in your home country. Other proofs aren't enforced afaik. It's how it works in Russia.
You are largely relying on just not being caught. Have you asked a tax advisor about this?
There's entire movement of perpetual travelers and laws clearly state it's legal.
I am familiar with PTs and I have been traveling since 2007.
It might be perfectly legal for Russian nationals. Since I am not Russian, I do not know with certainty, which is why I ask if you had checked with an expert.
Perhaps in Russia it's a bit... easier?