They have been warned this is our red line. I know Syria, but they have.

We have gone out of our way not to get directly involved. But.

Here

https://www.lgraham.senate.gov/public/index.cfm/2023/6/graham-blumenthal-introduce-resolution-to-address-threat-of-russian-tactical-nukes#:~:text=Graham%20and%20Blumenthal%20noted%20their,requiring%20an%20Article%20V%20response.