About 5 times larger. It doesn´t change that Russia has ammo while the West has to ask Pakistan and other countries.
You guys always take nominal GDP to measure an economy´s size, btw, but that is impossible. Since the true size of an economy is measured by produced goods and delivered services and not by the prices that were paid for them, nominal GDP cannot be taken to compare countries. You must take GDP PPP, another name for this is Real GDP, to compare countries. In Real GDP, a product will have the same price, whether produced in the US or in Russia: The US price. Of course, this doesn´t reflect the actual amount of cash that flowed (nominal GDP shows that) but it helps to understand the actual economic performance in terms of production and services. It means, Russia is the 6th largest economy. Most stuff is very cheap there, that is why the Russian nominal GDP is so low.
en.wikipedia.org