I would like to believe this, but surely the Russians will adapt..
The Russians have been able to adapt in some areas, but have completely failed in others. They switched from attempting a fast maneuver warfare victory in the early going to brutal artillery barges on Ukrainian positions and towns followed by advances by poorly trained infantry and armor that takes objectives, but at a very steep price. On the other hand they haven't figured out that Russia can't just throw bodies at an objective until they succeed anymore. In previous wars Russia/the USSR had a large population they could sacrifice to get what they wanted. But Russia has had a low birth rate for 40 years and they lost half their population with the USSR breaking up. They don't have unlimited manpower any more.
Russia has been very slow to adapt to the cold reality they have a manpower shortage. This not just extends to their infantry shortage, but also to their logistics train. Western armies have a logistics train optimized to do as much as possible with as few people as possible. There are lots of labor saving equipment as well as packaging to that end. Russia still moves most of its cargo by getting a bunch of guys to lift and haul WW II style wooden crates with ammo. It's a time suck as well as diverting a bunch of people from other jobs just to get the truck unloaded.
Decentralization is another thing I think the Russians are going to struggle to adopt because their military and government is so centralized. NATO armies have largely adapted the German and American style of training soldiers at all levels to think for themselves to a large degree. It encourages innovation and enables isolated troops to get things done without having to hear from a higher level of command. It also allows the organization to flew around command losses. It was not unusual in heavy combat for platoons to lose their officer and a sergeant take temporary command. Occasionally companies would end up with a sergeant in command for a short period. Similarly low ranking officers could end up in charge of a much larger unit than they were qualified for on paper, but they managed.
Russia's army is all top down. They have never had a very effective NCO corps and officers do a lot of the jobs NCOs do in other armies. Troops are trained to not do anything on their own initiative. Lower ranks could face punishment for taking initiative, even if they did the right thing. As a result smaller elements are often paralyzed when out of contact with a higher headquarters. The Ukrainian campaign to take out HQs and high ranking officers has more of a detrimental effect on the Russian army than it does most other armies.
Distributing their supply depots would be a rational step to protecting their supplies from the Ukrainians, but they would probably be far less effective in distributing supply than the centralized depots because nobody wants to make decisions at the small depots and everything has to go up the chain of command.
Additionally the Russians are extremely tied to the rail network. Trains can be offloaded track side in the middle of nowhere, but without platforms or any of the equipment available at a station, unloading the trains will be even less efficient than it is now. The Ukrainians will also be looking for trains stopping in unusual places and will be watching where the supply is moved. They will wait until some builds up and hit it with HIMARS.
The only way the Russians can really prevent supply depots from being taken out by HIMARS is to move the depots out of range. That makes the trips the trucks make longer and reduces efficiency, by factors of 4X or more, but it protects their supply. It also wears out the trucks a lot faster and the Ukrainians will target trucks to artillery attacks.
Looks like HIMARs is widening its target set to include not just ammo dumps but also : C&C centres, S400 SAM sites, rail nodes, and troop concentrations. And if you keep an eye on the various information leaks from Kherson area there is very significant progress being made.
The first season of the Ukraine War was the assault on Kyiv, ending with Russia’s humiliating retreat. The second season was the Battle of Donbas, which ended on a cliff hanger with Russia taking Severodonetsk and Lysychansk (and with it, Luhansk...
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If the Ukrainians can degrade the Russian AA network enough, then they can start deploying more aircraft.
It might be a slow fight, but I expect the Ukrainians will eventually push the Russians back to the Feb 24 line. Assuming the western powers keep up the supply chain.
Russian artillery is going to be supply starved soon. That's about the only thing they have that is working for them. Take that out of the fight and the Russians will have a hard time stopping the Ukrainians. The Russians will be on the defensive, which is an advantage, but on defense, you need infantry to hold ground and the Russians have a bad infantry shortage.