Is an attack on the leader of a NATO country whilst outside NATO considered an attack on NATO, and thus a trigger to Article 5? [duplicate]

Leaders of 3 NATO countries are going to Kyiv to meet the president of Ukraine. Parts of Kyiv are currently under missile and artillery attack from Russia.

If one or more leaders of a NATO country are killed or injured by an attack while outside of NATO (e.g. in Kyiv), is that considered an attack on NATO, and therefore a trigger Article 5?