I have not seen any evidence of that high of a Russian to Ukrainian kill ratio.
It is possible, but seems unlikely.
The USA routinely promoted high "kill ratios" in Vietnam, which turned out to be inaccurate.
The Ukrainians are appearing to be much closer in capabilities to the Russians than the Vietnamese were to the Americans.
I would not be surprised if the Russian to Ukraininan Kill ratio was 2 or 3:1, because the Russians are, essentially surrounded by targets, but most of those are non-combatants.
“I have not seen any evidence of that high of a Russian to Ukrainian kill ratio.”
Really?
Did you actually read the articles provided?
Did you comprehend what you read from those articles provided?
Just FYI, after the Vietnam war, US authorities estimated the total numbers of North Viet Armed Forces and Viet Cong dead as somewhere in the area of 880,000 or so during the US phase of the Vietnam War. After the war, Gen. Giap admitted to about 1.1 million dead, with between 275,000 or so South Viet military casualties. He said that he wanted the world to fully appreciate the nature and sacrificial resolve of the Vietnamese people to achieve final victory.
It would appear that the US actually underestimated the numbers of enemy troops that were killed, notwithstanding the occasional body count inflation by commanders who were often pressured to do so by those higher ups obsessed with the body count metric.
My 18 months of battlefield experiences, along with many other vets that I have spoken to over the years tend to bear this out. The North Viets were simply motivated (often by the totalitarian authoritarian regime as well as nationalistic patriotism) to endure whatever level of loss that was necessary until the US tired of the slaughter on both sides.