Appeasement

File under ... “those who don't know history are destined to repeat it”.

This policy is called appeasement ...

Appeasement, in an international context, is a diplomatic negotiation policy of making political, material, or territorial concessions to an aggressive power with intention to avoid conflict.

The term is most often applied to the foreign policy between 1935 and 1939 of the British governments of Prime Ministers Ramsay MacDonald, Stanley Baldwin and most notably Neville Chamberlain towards Nazi Germany and Fascist Italy.

It doesn't work out too well.