the population. >> russian air strikes are moving ever closer to the west. ever closer toward nato territory, 12 miles away from poland. ukrainian president zelenskyy said it only a matter of time before the bombs end up dropping in a nato country. how much would that change the war? >> reporter: well, it could potentially drag nato, europe, the united states into a broader, multidimensional years-long conflict with russia. there are many analysts that say that russia is keen to avoid that. there are many who say if russia can't fuel the own tanks, how could it really think it could take on an line of possibly a billion people and has the largest military budget in human history. that's the plain facts of the matter. but then there is the state of mine of vladimir putin who has undertaken something preposterous.