East Front News #62: Poland invokes NATO's article 4; Sweden sends Archers to Ukraine Defence24 com 12.09.2025 11:21 DrukujPDFPhoto. Poland invokes NATO article 4Poland has formally invoked NATO’s Article 4 after Russian missile strikes on its territory, marking only the eighth use of this mechanism in the Alliance’s history. Unlike Article 5, which obliges collective defense, Article 4 is a political tool for urgent consultations when a member feels its security is threatened. Author: dr Aleksander OlechRead more Poland Triggers NATO’s Article 4Sweden sends 18 Archers and more to UkraineThe Prime Minister of Sweden has confirmed another package of military support for Ukraine. In addition to its assistance to Poland, Sweden will also provide significant military support to Ukraine.