In regards to the first part of the question...
Winston Churchill was against appeasement as he didn't believe the policy would be successful. When Hitler took over the rest of Czechoslovakia in 1939, it proved the policy of appeasement had failed.
In regards to the second part of the question...
There were parallels between the actions of Germany and the Soviet Union, although at different time periods. Churchill made the link, proclaiming that we could not "appease" the Soviet Union, when it came to their actions in Berlin. {Study the Berlin Airlift if you want a more detailed explanation.}
- Hope this helped.