Even a truncated Russian Federation has four times the pre-war population of Ukraine. It enjoys well over 10 times the Ukrainian gross domestic product. Russia covers almost 30 times Ukraines area.
And how does Ukraine expel Russian troops from its borders when its Western allies must put particular restrictions on their life-giving military and financial aid?
The interests of Europe and the United States are not quite the same as those of a beleaguered Ukraine. NATO also wants Vladimir Putin humiliated, but only if the war can be confined within the borders of Ukraine.
The West seeks a resounding reaffirmation for the supposed rules-based international order that prevents aggressive invasions across national bordersbut not at the price of a nuclear exchange.
So to accomplish those grand agendas, the West restricts some of its generous supplies to Ukraine. It sends plenty of lethal weaponsas long as some of them will not provoke a losing Russia into doing something stupid, like resorting to tactical nuclear weapons to save face.
There are other complications. Time is fickle. In theory, it should favor a resilient Ukraine.
The longer the war goes on, the more sanctions will hurt the Russian economy and insidiously undermine Russian public support for the war.
On the other hand, the longer the war continues, the greater the Russian losses, and the fewer acceptable off-ramps for Putin, all the more likely he will grow desperate and escalate to Götterdӓmmerung levels.
Admittedly, Putin is no longer fighting to win over Ukraine and force it back intact into the Russian federation. He is no longer wary of eradicating infrastructure that he once felt would once again become valuable Russian assets.
Instead, Russia is going full Carthaginian peace in Eastern Ukraineleveling cities, murdering civilians, and destroying an entire modern society for generations.
There is as yet still no deterrent force that can stop his bombs and missiles and disrupt Putins nihilist strategy. Again, Putin feels liberated by caring nothing about international opinion, and less than nothing about Western outrage over reported Russian war crimes.
Putin instead believes the stick, of an unpredictable Russia with 7,000 nuclear weapons, and its carrot, of becoming the worlds largest daily producer of oil, cut a lot of lofty talk about humanity.
So the war has become more complex precisely because Putin failed in his initial shock-and-awe effort to decapitate the Ukrainian government, storm the cities, and install a puppet government.
Putins strategy is now paradoxically much simplerand harder to stop. He will claim victory by institutionalizing Vichy-like Russian states in the Donbass region and Crimea.
In the meantime his air attacks will render Eastern Ukraine an inert wasteland that will require decades to rebuild.
Even after an armistice, Putin can periodically threaten to expand his devastation to Western Ukraine, should he feel Kyiv is once again growing too close to Europe.
So can Ukraine ever win?
Ukraine must stop the airborne wreckage by gaining air supremacy through the use of more sophisticated and larger anti-aircraft batteries and far more SAMs and Stinger smaller systems. Some NATO nations may have to send Ukraine their Soviet-era fighters to replace losseswith conditions that they stay inside Ukrainian air space.
Second, the supply war must no longer be defined as a larger Russian economy versus tiny Ukraine.
Instead, Putin is now warring against the supply chain of all of Europe and the United Statesand all out of his reach. The Ukrainian war machine will only growif fueled by allies that combined account for 70 percent of the worlds GDP.
Putin cannot stop the influx of Western help unless he threatens to use nuclear weapons.
Ukraine may reach a tipping point soon if it can both stop Russian air attacks and expel Putins ground troops from its cities.
But Kyiv cannot realistically invade Russia to hit its supply depots. It cannot go nuclear to deter future Russian invasions. It cannot shame a bloodthirsty Putin on the worlds humanitarian stage.
And it cannot join NATO to win the direct help of 30 other nations.
But what Ukraine can do is push Russian troops back to the border regions and let the Russian-speaking Ukrainian borderlands work out their own star-crossed relationships with a now blood-soaked and unreliable Putin.
It can inflict such death and destruction on the conventional Russian military that Putin will fear he will suffer even worse global humiliation that the United States faced after Afghanistan.
Ukraine can also seek an armistice along the Black Sea coast. It might agree to a plebiscite or some sort of demilitarized zone and small-scale population exchanges to ensure that Crimea does not become a permanent battleground.
All that is not outright victory, but it is something. And that something was not imaginable when Russia invaded in late February.