Option 1 (Bold & Alarming):

🚨 Russia's New Doomsday Machine: The 'Khabarovsk' & Its Poseidon Nuke Torpedoes!

Option 2 (Intriguing & Questioning):

🌊 Silent Threat or Global Game-Changer? Russia's Poseidon Submarine Unveiled!

Option 3 (Direct & Factual with Impact):

☢️ Khabarovsk Submarine Launched: Carrying 6 Poseidon Nuclear Tsunami Weapons

Option 4 (Short & Punchy):

💥 Poseidon's Power: Russia's New Submarine Raises Global Concerns!

Option 5 (Focus on the Tsunami aspect):

🌊 The Tsunami Threat is Real: Meet Russia's Khabarovsk & Its Poseidon Torpedoes