Nato's Articles 4 and 5: How the Ukraine conflict could trigger its defence obligations

The following is an explanation of Article 4 Article 5 and what might occur if they are activated

Police officers gather outside a grain depot in Przewodow, eastern Poland, on Tuesday Nov. 15, 2022 where the Polish Foreign Ministry said that a Russian-made missile fell and killed two people. Picture: AP Photo

A deadly explosion occurred in NATO member Poland's territory near its border with Ukraine on Tuesday, and the United States and its allies said they were investigating unconfirmed reports the blast had been caused by stray Russian-made missiles.

The explosion, which firefighters said killed two people, raised concerns of Russia's war in Ukraine becoming a wider conflict. Polish authorities said it was caused by a Russian-made rocket, but Russia's defence ministry denied involvement. US President Joe Biden said it was “unlikely” to have been fired from Russia.