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I also wonder why England did not declare war to Russia as well
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Maybe Britain and Poland hadn't signed up against Russia
Protocol 1
The Government of the United Kingdom and Northern Ireland and the Polish Government are agreed upon the following interpretation of the Agreement of Mutual Assistance signed this day as alone authentic and binding.
1. (a) By the expression "a European Power" employed in the Agreement is to be understood Germany. (b) In the event of action within the meaning of Article 1 or 2 of the Agreement by a European Power other than Germany, the Contracting Parties will consult together on the measures to be taken in common.
Seems pretty clear cut doesn't it, Poland agreed that invasion by any country apart from Germany would only trigger some talks between Britain and Poland.