Because the missile fired against the 2nd rate cruiser Moscow was US made and deployed.
Also, the cruiser in question was an old mothballed relic of the 1970s they brought out, repainted and refurbished, to be deployed in this little border war. It’s not THE FLAGSHIP OF RUSSIA, as the MSM CIA slugs are selling and shilling online. It was a mothballed old retired turd brought out as a sacrificial lamb. Look it up. It’s legit.