I'm sure that Biden is also at least a little bit like "well, it's just Ukraine and nothing important, I won't risk anything for such a country". Obviously not as bad as Trump who probably even likes Putin for some stuff but if Russia would attack a country like UK, Germany or France (even if they wouldn't be in NATO)? Putin would be maybe dead already.
But in the end, for many on this planet it's "just" Ukraine which suffers. Many couldn't even tell where Ukraine is before the war.