The incident seemingly marks the first time that Russian President Vladimir Putin's war has spilled across Ukraine's borders and into the territory of a NATO member.The missiles landed in the village of Przewodów, which is located in eastern Poland a short distance from Ukraine's western border, and reportedly came amid a barrage of over 90 Russian missiles that targeted Ukraine's infrastructure.But Article 5 has only been invoked once in NATO's history, following the terror attacks against the US on September 11, 2001.Article 5 states that NATO members will assist the attacked party or parties by "taking forthwith, individually and in concert with the other Parties, such action as it deems necessary, including the use of armed force, to restore and maintain the security of the North Atlantic area."A spokesperson for the Hungarian government said that Prime Minister Viktor Orbán would also convene a meeting of the country's defense council in response to "the missile hitting territory of Poland.""