The entire Russian economy is smaller than the entire Economy of Texas alone. But despite more resources and wealth, the US is still very hesitant about invading Iran. Why? They learnt from their mistakes in Iraq, Afghanistan and Vietnam. Invasions are costly both in terms of Money and politics. Well Putin is not a good student of history, one of the Main reason the USSR collapsed (leading to independence of countries like Ukraine) was its botched invasion of Afghanistan in the 80s and mark this tweet, Putins grip of Russia will meet its waterloo due to the political heat the mess up in Ukraine will create.