How Russia might use four modernized Kirovs

How would Russia deploy four Kirov-class battlecruisers kept modernized from 2000 onward?

One could serve each major Black Sea, Northern, and Pacific fleet while a fourth conducted global deployments; sustained investment would likely replace the need for Slava-class flagships and avoid Moskva's modernization problems.

The answer treats the nuclear battlecruisers as both combatants and visible symbols of Russian state power. A three-fleet distribution plus one rotating worldwide gives each major command a flagship while preserving an overseas presence. Keeping all four credible would imply a better-funded nuclear surface force and probably less reliance on the Slavas, which were conceived as a cheaper insurance policy.