Russia's invasion of Ukraine has alarmed neighboring countries and Sweden's bringing back its guide to surviving war.

The two Nordic nations joined NATO after Russia’s invasion of Ukraine. With tensions rising, they are preparing their citizens in the event the threat spreads.

Sweden and Finland have all begun warning their residents to prepare for the possibility of war as Russia’s full-scale invasion of Ukraine rages on.

Both countries are publishing and disseminating new documents with guidelines in case "the worst-case scenario: an armed attack" occurs. "We live in uncertain times. If we are attacked, we all must do our part to defend our independence and democracy.

Putin launched his “special operation” in Ukraine and both countries joined NATO. Finland and Sweden are now preparing their populations for the possibility of war. This week, Sweden sent out 5 million booklets entitled “Om krisen eller kriget kommer” (“In case of crisis or war”) to its inhabitants.