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F16 will also change the game. Those GBUs modified to "fly" may be just to risky to launch any longer.
All these things together are effectively game changers. Also for Ukraine, as attacking in large formations or with over abundance of mechanized means is no longer a good option.
You forget one major thing regarding the F16s, In the past Russia had no reason to maintain a technologically competitive war force. But since the US is stubbornly pushing Nato's growth, and since the US won't back down regarding treaties to stop this, Russia is pushing its own growth in every way.
By now Russia's military growth acceleration has more than doubled; it might even have tripled since the beginning of the war. In the same time, the US and Nato, because of the way they gave their military toys to Ukraine only to lose them, are far behind Russia in rebuilding their military strength.
Russia doesn't want a major war. But she has been bolstering her relations with BRICS countries, and with the 41 (or so) countries who want to join BRICS. These countries should start by kicking the US military bases off their lands, and see what the US wants to do about it.

You are thinking of Ruzzia as the Soviet Union, they are not even half of what it was during the soviet period. Gunshells sure... they can produce, basic artillery, low tech drones, a couple of hundred T90 per year, a couple of hundred of missiles (IF at all),... Certainly not at the rate they have to if trying to sustain a high intensity war.
But - planes such as the ILs destroyed by drones, S-400 systems like the two recently destroyed, ships like the ones they have lost or planes like the ones that they do not even dare to use in the frontline (yes... Sukoy, I am talking to you),... that is gone for quite a few years if they are ever to come back. Billions of technologically advanced products.
RE BRICS, well, you know...
“The Security Council has been progressively losing its credibility. This frailty is the specific result of actions from its permanent members who wage unauthorized wars or regime change. Its paralysis is the most eloquent proof of the urgent need to reform it, which will bring it greater representation and efficacy.”
This is Lula da Silva speaking at the
United Nations. It does not sound like in support of an illegal war from Ruzzia does it?