Which one would you choose if you were Britain in 1938? Also curious about "strengthening diplomatic relations" with a country whose soldiers enthusiastically

Which one would you choose if you were Britain in 1938? Also curious about "strengthening diplomatic relations" with a country whose soldiers enthusiastically commit "bottom-up" mass murder and rape while its government joyfully obliterates civilian targets like apartment blocks as a matter of deliberate "top-down" policy. Like, how does it work? Do you simply ignore reality while holding said relations and focus on the positives?