He’s getting closer to being the first Pope to formally defect from the Church and depose himself.
If that happens, expect a repeat of the Great Western Schism of 1378-1417, right down to the parish level. Expect Francis to call upon the EU or UN to keep him in the Vatican and his successor out by force.
The Great Western Schism involved Catholic papal claimants. Francis is not Catholic.
What forces?
The UN is not as strong as you think and pretty much the USA armed forces protect the EU.