This is - again, I can't emphasize enough - all a joke about a hypothetical situation.

Bibi has not been arrested, he won't be arrested anytime soon, and the US is not at the point where they are willing to invade Europe to save him.

What do I think Mossad would do in the made up, improbable, alternate universe where we are debating the US invading their European allies?

I think that Mossad/Israeli security would never be caught flatfooted enough to allow Israeli leaders to visit a country that was planning to arrest them. I thoroughly believe that it would be nigh impossible to maneuver an Israeli head of state into a position where they were arrested. If things change and he is no longer protected by Israeli security, that is different.

So in answer to your question, no Mossad is not going to be breaking him out of a maximum security prison. They are going to use their intelligence network to say "Hey Benji, stay out Canada. They are going to arrest you, and have you tried if you set foot on their soil". Or "Hey Bibs, this state visit is mildly risky, we have an extraction plan in place if shit goes sideways."

Of course not, haven't you seen any movies? They break him out during transport, either by hijacking a plane, or through a complicated series of car and bus chase scenes! Maybe a helicopter and submarine, too.