They sit on their bum lobbing artillery and digging trenches while DPR, Wagner and Chechen attack. People are calling for mobilisation to be able to gain ground, not because they are gone... Invading Ukraine with just 300k is nonsense, you need more just to keep the front stable. It's why it's a standstill and all this operation is relying on standoff weapons. You cannot take or keep ground without enough troops.
Agreed about the need to have enough soldiers.
Disagreed about how good for Russia is this stalemate.
They aren’t totally wrong. For the US, the average infantryman’s training pipeline is about 5 months (look into OSUT for more details). Of course, it takes more time for that soldier to get up to speed with the units and that is dependent on the unit, but the core training that is required for a professional soldier is 5 months.
However they are kind of mistaken for the 2 month aspect. In the US, the IRR (Individual Ready Reserve which are troops no longer in reserve or active duty) may need to attend 30 days of training per year for the remainder of their contract. Plus after mobilization there will be an emphasis on the most important aspects of their training during the first 30 days after mobilization. So there may be additional training after those 30 days.
On a seperate note, for the Ukrainians, according to the 3rd Separate Assault Brigade's (which is led by veterans from the Azov Regiment) recruitment site, the training time length from start to finish is 30 days. For the Russians, if I remember correctly, Wagner gives 10 weeks of training to their new recruits.
So, assuming the training is led well by experienced instructors, a 2 month pipeline is theoretically enough for those who served in the past.
Of course it's enough. They do not deploy nuclear physicists, but grunts. They need to know how to duck, go low and slow, cover each other, put a shell into mortar, howitzer, dig a trench etc. And the most import thing, they have done that allready before.
In case of need, they should be able to relearn it within a few days. Okay, phisical fitness needs more time, but considering rate of Russian advance in last year, even that isn't so important.
So, to conclude, as for the training, they could by now allmost start deploying third wave of mobilisation.
But, real problem isn't the training, it's political will to do mobilisation and lack of modern equipment to give to mobilised soldiers.
Why lack of political will? Because average Ivan simply don't sees this war as existential threat to Russia. More like Putin's War. Of course that average Ivan would like to see Ukraine under Russian rule, but not if he and a million other Russians have to die for that. Plus, if real mobilisation is carried, then they would be sent into a battlefield with equipment like T-55/62, BMP-1 etc, and that's just about death sentence. Of course, if Russia is seriously in jeopardy, like in WW2, people would fight with flintlocks and stones, but it simply isn't. There's nuclear weapons to prevent that. And people do know it.
Therefore, Kremlin fears revolution or civil disorder, like America had in Vietnam, so they avoid mobilisation as plague.
