A lot of it is because transportation is quite difficult. Even today huge tracts in Russia are without any roads. On the opposite end of the spectrum is the US, where even before the railroad and the automobile, transportation was quite easy, with navigable rivers flowing through the best farmland in the world.

Another big piece is how easy it is to invade; how hard it is to defend. History records 50 invasions of Russia. For centuries Russian looked in envy at the very fertile land in what is now Southern Russia and Eastern Ukraine, but dared not farm it because it was swept regularly by quite fierce nomads on horses. That farmland became secure enough to farm only about 250 years ago.

On the opposite end of the spectrum is Great Britain, which has been successfully invaded, but not after Britain got serious (about 4 centuries ago?) about having a good navy. When the risk of the investment's being destroyed by an invading army is low, more investment happens. And a navy profits more than an army does from technological investment: 100 years before Britain's industrial revolution, London was investing heavily in copper mining and copper refining so that it could give all of its warships a copper bottom.

The US is even more secure than Great Britain because any great power or middle power contemplating an invasion of the US would need to cross either the Atlantic or the Pacific to start the attack. (Yes, the invader could try to get Mexico to agree to host the invading army, but the US would probably find out about that plan and respond by either blockading Mexico or invading it if it doesn't immediately abandon the plan.)

Policies that work great for secure countries like the US and Britain work terribly for countries like Russia, China, Iraq or Iran that must always worry about a land invasion. The basic strategy the US and the UK used in WWII had been worked out by Britain during the Napoleonic wars. Japan and Australia can follow the same basic strategy. Russia cannot because except for a few heady decades during the Soviet Union and maybe in the 1890s, the best way to increase Russian security was always to invest more in the army what with the country's being so hard to defend against a hostile army.