I don't think that Putin ever wanted to reform Russian political or economic system.
Why?
Now he have absolute power in Russia and can do whatever he want.
His biggest failure?
In my opinion conflict he caused in Ukraine, and all bad results Russia received from it, including trade lost with EU.
Because of Putin all former Easter block (Poland, Ukraine etc) demanding that Nato soldiers came in their countries and protect them from Russia.
It's big strategic mistake because Russia lost their influence in this area.
Do you honestly believe what you write? Please do a reality check.
Ukraine? I don't remember Putin giving Nudelman/Biden orders to deliver cookies to Kiev and to start the Nazi coup.
Russia did receive slightly bad (somewhat outweighed by the good) results from the sanctions, but harming Russia and blocking trade between Russia and Germany was the intended goal, when US started the coup in Ukraine.
Eastern block asking for NATO soldiers? (Ukraine is Russia, btw) Don't mix up the people of those countries and the political tops. The weekly anti-NATO protests in Bulgaria, for example, seem to be ignored second year in a row.