What does churchill mean when he described russia as being “ a riddle, wrapped in a mystery, inside an enigma”?

This is how Churchill expressed inability to predict what Soviet Union will at the start of World War 2. The timeline below show why he could be puzzled:

a) August 23,  1939 - Soviet Union and Germany sign non-aggression pact

b) September 1, 1939 - Germany invades Poland (then ally of Britain and France).

c) September 3, 1939 - Britain declares war on Germany as a consequence of German's invasion of Poland.

d) September 17, 1939 - Soviet Union invades eastern Poland. Poland is defeated and partitioned between Germany and Soviet Union.

Therefore from Churchill standpoint: Soviet Union is allied with Germany, whom are at war with Britain. Go figure what Stalin is going to do?

disequilibrium means that either supply is greater than the demand for an available good, or that the demand for a product outstrips the available supply. it implies that the price for a is either too low creating large demand, or too high creating a large surplus of supply.

the answer is c, all the other options are things they are known for.

hope this ☺️