Russia caused more suffering in a few months of war than the USA in a decade in Vietnam.Absolutely and obviously false, as you will quickly reveal to yourself by spending a few seconds looking up the toll of civilian deaths and maimings during the US-driven conflict in Vietnam.
Comparing the two is utterly dishonest.
The comparison is in any case completely vacuous. There's no indication that you're being dishonest here, however. Most likely it's a case of simple willful ignorance.
In this example, one among countless others,
There are exactly 3 others since WW2: Chechnya, Syria, Afghanistan.
Their number is not, by any stretch, "countless".