Sorry, but nothing you said is uncommon in your democratic countries

Use a loophole to run for a third term of presidency by becoming prime minister.

Macron used a loophole to do a very unpopular retirement pension reform bypassing congress.

Rewrite the constitution during your third term to remove your term limit.

Didn't know amending the constitution or re-writing it was anti-democratic. Then no democratic country would ever pass this test.

Jail your political opponents.

Like Ukraine did? https://apnews.com/article/europe-ukraine-arrests-business-government-and-politics-f50da684fab61add42348d276482477c

Or like Germany is doing right now?

https://www.middleeasteye.net/news/germany-crackdown-israel-gaza-jewish-activist

Assassinate critics.

Learn about COINTELPRO.

Only allow approved opposition to run.

Ukraine again:

https://www.aljazeera.com/opinions/2022/3/21/why-did-ukraine-suspend-11-pro-russia-parties

Brutally crush any democratic protests.

Can you not see what is happening right now to anti-genocide protesters? Also what about Odessa massacre?

https://www.peoplesworld.org/article/the-odessa-trade-union-massacre-ten-years-later/

Force government employees to vote for you.

AFAIK, vote is still done in secrecy in Russia.

Start a war to rally support for yourself.

Like, the Iraqi, Lybia, Afghanistan and Iran wars? Or Yugoslavia?

~~Take lots of weird, shirtless, old-man photos.~~

I think you have some kind of kink with Putin, why does this have anything to do with being democratic or not?

TLDR;

That said, the points you listed are not uncommon in any democratic countries. Unless you say that no country is democratic, therefore I will agree with you. Neither Russia nor any other country in the West or in any part in the world is actually democratic.