We could warn Russia and China just before the bird flew and a Trident thundering overhead with it's booster still burning is far more dramatic than a Tomahawk. We would have to dispatch some ships along with it for defense because it would require being pretty close.
um,....no.
No, the D-5 has a minimum range, too. To get a burning 1st stage rocket overhead, we'd have to launch right in the Yellow Sea, by Pyonyang, aimimg across the city, at a target in Russia... or maybe Alaska.
Warning Russia that it was a stunt would not make them any happier about the trajectory.
But, really, a Tomahawk scattering fireworks across the sky would definitely send the message to the right people.
"You are in range. Now, tonight, tomorrow, any time we want to. You didnblow up today because we choose not to."