in the event

"The US embassy recommends US citizens be prepared to immediately shelter in the event an air alert is announced."

It has also expressed “grave concern” over a pact between Pyongyang and Moscow, which pledges that the two counties will help each other in the event of “aggression” against either country.

In a detailed section on military conflict, the Finnish digital brochure explains how the government and president would respond in the event of an armed attack, stressing that Finland’s authorities are “well prepared for self defence”.

On Monday, millions of Swedes will start receiving copies of a pamphlet advising the population how to prepare and cope in the event of war or other unexpected crises.

And Norwegians have also recently received a pamphlet urging them to be prepared to manage on their own for a week in the event of extreme weather, war and other threats.