Answer:
He claimed that the formation of alliances between England and other countries against Germany, could prevent it from becoming Sudetenland.
Step-by-step explanation:
Churcill believed that if England made alliances with countries that were also against Germany, it would be possible to stall the entire English army to fight Germany, especially in relation to the English air force. If England were to strengthen, it would be able to stop the German advance, preventing Germany from becoming a Sudetenland.