The BBC immediately resorts to name calling ("Stalinist" author...), and conflates Russian approval of Hitler before WWII as Russian approval now, which is ludicrous. (Stalin didn't have much choice but to agree to a non aggression pact with Hitler considering his resources.) BBC pretends Russia is unchanged in 65 years, when the truth is Russians have learned their lessons well.
No, Stalin quite eagerly entered into the alliance with Nazi Germany. The quid pro quo was the joint invasion of Poland and a free hand for the Soviets in the Baltics. Stalin looked at the pact as a big win for the Soviet Union.