That's like Pakistan considering KAshmir to be its territory or China considering Arunachal Pradesh/Ladakh as its own. Whether the Russians (or Putin) want the Ukrainians to turn against them or not is irrelevant if the Ukrainians themselves decide to turn against them.
That's factually, verifiably wrong. So far, the Russians have used every tank (or a variant thereof) in their inventory except the T-14 Armata, which hasn't been produced in any meaningful quantity yet. And yes, the Russians have used and lost (or abandoned) T90s in the war.
Again, verifiably, they have used their best fighter jets (Su-35, Su-34 etc.), their best helicopters (eg. Kamov Ka-52) and their best tanks and have sustained losses.
All people are savages, by those standards.
By every single account, the Battle of Hydaspes against Porus had been won by Alexander quite handily. And Ambhi had surrendered without a fight. Now there are tales that his army mutinied before he marched on the Nandas, but he never met in battle, and as such, he wasn't defeated on the Indian borders (Nanda empire had its borders well within India).
On that note, remember the Cholas? You know, Karikala, or Rajaraja, or Rajendra 1?