No, this is completely wrong. Our country is in this dire situation because for too long we took our economic strength for granted and therefore did not reform and innovative. That is the reason why Angela Merkel was so popular - she avoided changes and the people liked that.
Now our infrastructure is in a very bad shape (bridges are literally falling apart), our trains are running far behind schedule (if they run at all), our education system is a complete and utter disaster and our bureaucracy is paralyzing the economy.
These are the main reasons, combined with a heavy dose of arrogance (“German cars are the best in the world”). The sanctions had only a very short and limited negative effect.
So please go back to your masters in the Kremlin or wherever in Russia they are hiding and ask for a better preparation. I’m sure you could do better, however I am not convinced you should.