My response as a western leader would appeal directly to the Russian people.
"This man (Putin) has ruined your lives. He has brought all this economic and reputational destruction to your country. Take it back! Bring us his head on a silver platter! You have the power to save yourselves from this madman. And to the soldiers of Russia, your allegiance is to your people and country, your duty to protect them, NOT Putin, not this singular despicable human. Be proud, you are strong! You can end this swiftly without foreign interference in your lands."
Something along those lines. Inspire them and build them up to remove Putin.
My response as a western leader would appeal directly to the Russian people.
"This man (Putin) has ruined your lives. He has brought all this economic and reputational destruction to your country. Take it back! Bring us his head on a silver platter! You have the power to save yourselves from this madman. And to the soldiers of Russia, your allegiance is to your people and country, your duty to protect them, NOT Putin, not this singular despicable human. Be proud, you are strong! You can end this swiftly without foreign interference in your lands."
Something along those lines. Inspire them and build them up to remove Putin.