That is George Orwell, writing on this day in 1939 on the news of the signing of the Molotov-Ribbentrop Pact. Interestingly, he had this to say about Neville Chamberlain:
Chamberlain’s speech as reported on wireless very strong & hardly seems to allow loophole for escape from aiding Poles.
Most do not remember Chamberlain as being so resolute. All of Orwell's diaries are being published in order, 70 years to the day from the time they were written. Today's entry is here.