I am watching the Battlefield series and I’m currently on the episode: “The Battle of Normandy” and this statement is made. It is not expounded upon. Why did Churchill believe that the invasion of Italy was more important to dealing with the future of the Soviet union?
There's always more to be said, but you may be interested in /u/Ornlu_Wolfjarl's answer to Why was Winston Churchill so seemingly obsessed with the "soft underbelly" of the enemy? He backed both the failed Galippoli invasion in WW1 and the underwhelming Italian Campaign in WW2.