Why did Russia attack Poland?

Poland is a NATO. If article 5 is triggered we will got to war with Russia
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Thanks for the everyone's views. This is very worrying news. It has been confirmed it was a Russian made missile 😕
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It was an accident. Still doesn't justify that people died and continue dying! They may hold a emergency meeting. If they do I'll probably post a new question as I don't know if I can update anymore.
Why did Russia attack Poland?
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