"a second tier military, protected by no significant natural barriers. "
Just shows how ignorant your knowledge is and where you parrot your narrative.
No, it is NOT a second tier military force, it is Slavs primary fighting against brother Slavs whose fathers and grandfathers belonged in the mighty Red Army that finished off Germany in Russia and Japanese Imperial Army in Manchuria. Also since 2014, NATO has been training and stock piling weapons there, and Russia was pathetically naive and trusting, relying on 2 treacherous fake "Minsk" agreements which were cunningly used as a smokescreen (admitted by Angela Merkel). This is the underlying and subtle plot to try weaken and threaten the security of Russia...this is the real reason behind this civil war.
'Natural barriers"...well there might not be natural barriers, but since the coup in 2014, far Rightists have been building heavy fortifications all over the Donbass, with Bakhmut being the most fortified. Also Ukraine soil when wet has 6 ft in mud...it is a very rich soft blackish soil (ideal for crops of wheat, sunflower and other crops ).
Heavy military vehicles, especially tanks are rendered almost useless under such conditions.
The only difference between the military is the manpower and weapons. Russia has plenty of both (don't worry they have). Poor Ukrainians have nothing left, except that the west keeps pouring them in as if their lives depend on it. That's why they are prepared to spend such vast amounts on it.
This conflict would have ended much sooner if USA and NATO had stayed out of it.
I'd rather draw my conclusions from several proven war veterans who have nothing to gain to be honest and tell it as it is.
Doug MacGregor and Brian Berletic are men with courage and integrity and there are others too that can see through the wicked schemes of the Neo Cons and over promoted generals and hierarchy who are arse kissing sycophants with political ambitions who benefit from the sale of weapons.
We need a world of freedom where all countries are respected to live, trade, and rule what suits their choices , cultures and preferences without any power interfering for financial control and power. Equity and respect to all. Get rid of delusions of grandeur and superiority that the West thinks they are...China has already proved that, and yes China has never been a war monger and they don't want war. Neither did Russia until threatened...they have vast land and untapped resources and have a culture over many centuries that they treasure and want to keep.
I'm ashamed of cultures, that I once treasured but have since discovered that they are sullied with many hidden evils. God sees through all our facade and hypocrisy.
We need to turn or burn.