[Homer_J_Simpson]

The British government did not reply until May 8 to the Soviet proposals of April 16 for a military alliance. The response was a virtual rejection. It strengthened suspicions in Moscow that Chamberlain was not willing to make a military pact with Russia to prevent Hitler from taking Poland.

William L. Shirer, The Rise and Fall of the Third Reich

[Sherman Logan]

To be fair, such an alliance was doomed for other reasons.

Due to geography, there was no way Britain or France could bring troops directly to the aid of the Poles. Any reinforcements for Poland would have to come from the Red Army.

Since Poland had fought a major war less than 20 years previously for its survival against the Red Army, they were obviously less than anxious to allow Russian troops into Poland. They considered, accurately as it turned out, the Soviets to be as much their enemies as the Nazis.