Just something to put Putin's Ukraine folly into perspective.
In 2013, Russia had an economy of 2.3 trillion. Sanctions over Crimea saw it decline to a 1.3 trillion economy by 2016. At present, it is a 1.65 trillion economy, substantially smaller than pre-Crimea.
So, as a result thus far of Putin’s obsession with historic greatness, Russia's economy is smaller than that of Canada and South Korea and is competing against Brazil to be 11th largest economy. If not for Crimea, it would likely be competing with France for 7th largest economy, if it had good growth in those years it is also conceivable it would be the 5th largest economy.
And after this? Hard to say how hard sanctions will hit, but I'd say at the bare minimum, within a year or two Russia will be competing with Mexico to be the 15th largest economy. If the economy shrinks from a 1.6 trillion to a 1 trillion economy - quite possible as these are far more severe sanctions than those on 2014 which reduced it from a 2.3 trillion economy to a 1.3 trillion economy - then the Russian economy may end up smaller than that of Iran, Indonesia and the Netherlands, barely in the top 20.
It would seem that Putin's obsession with Ukraine is Russia's greatest obstacle to greatness. He is leading Russia to ruin.