How Northern Europe is preparing for war with Russia

In the shadow of the war in Ukraine, an invisible frontline has been taking shape in Europe. From Estonia to Norway, Le Monde met with high-ranking military officers to investigate this hybrid war, already a reality on Europe's northern borders. ✅ Subscribe to our YouTube channel now (and ring the bell for notifications 🔔) 👉 http://www.youtube.com/subscription_c... For more of our coverage on French and international news, culture and opinion, visit our website: https://www.lemonde.fr/en/