Typically, if the Kremlin says something, you consider the opposite true.

• Armour: severe shortage, soldiers often attacking in unprotected vehicles.
• Personnel: being outsourced from North Korea.
• Air defense: cannot hold back a drone swarm or decent missile.
• Rapid reserves: enough to keep Bashar al-Assad ruling Syria. Oops.
• Losses: 600 000 dumbest ones dead or wounded, 2 million smartest ones in emigration, paying taxes to some other land.
• Economy: interest rates over 20%, insolvencies widespread, butter sold from locked fridges.

…I can totally see them continue for a while, but not a long while. And the breaking point isn’t linked at all to Putin’s goals.