Jill Biden could be in the middle of Vvostol and the Russians would stop shelling in a second.
There is no way they are going to risk harming the USA's first lady.
"Putin would never ______" doesn't fit with the "Don't make Putin angry because he will launch nukes." warnings we see anytime we do more to help Ukraine.
If he's worried about harming our first lady, he certainly isn't ready to end the whole plannet.