THIS is the chilling moment Russia's nuke war sirens howled across the entire country as Vladimir Putin staged a dramatic nationwide alert test while rattling the nuclear sabre.

Across 11 time zones, from the Arctic wilds of Yamal-Nenets to the streets of Moscow , loudspeakers erupted with eerie wails followed by grim instructions.

Russians were told what to do if the sirens are sounded for real, for example to alert on the start of war or a missile strike or a freak weather incident.

They should “remain calm and don't panic”, “turn on the TV, or any public access channel, or radio and listen for an information announcement”.

TV and radio broadcasts were abruptly cut for a minute as the state ran its doomsday drill.

In the remote north Yamal-Nenets autonomous region, the warning

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