Why then had the Munich men refused all through the Spring and Summer to accept the only terms for an alliance with Russia which could mean anything to Russia? It was, says Schuman, because “all preferred the destruction of Poland to the Soviet defence of Poland. All hoped that the sequence would be a German-Soviet war over the spoils.” Is this a too stern judgment? It fits Ambassador Henderson, who told Hitler, on August 23, that he preferred a German-Soviet agreement to an Anglo-Soviet agreement.

Emphasis mine.

The Cold War & Its Origins, Vol. I, Denna F. Flemming, 1961, Chapter V