In Russia, Putin has his own Orthodox "father," Patriarch Kirill.
They see each other quite often, even though the constitution says that Russia is a secular country and religion is separate from the government.
If even the Russian Church is officially separated from Putin, why would a foreign "pope" think it possible to insist on a meeting in order to persuade the head of another state to end the war?
The pope has no status in such meetings. he takes too much on himself, really. He's a half-assed peacemaker.
Let the Italian pope go talk - the real instigators of the war. in Ukraine and in Israel, in Switzerland.
Persuading Putin is a waste of Putin's time, the truth is on his side.