Russia is to blame for both world wars. Russia's mobilization against Germany and Austria-Hungary transformed a local conflict between Austria and Serbia into a world war. Russia's pact with Hitler in August 1939 gave Hitler a free hand to conquer Poland, France, and several other countries. Russia continued to be Hitler's ally until Hitler invaded the USSR.
That's a leap right there.
What did Russia have to do with France and Britain declaring war against Germany and Austria?
To support Russia, against whom they both warred?