What is the ruling on inserting part of the glans into the vagina with a barrier present during Ramadan?

It is forbidden to engage in what you asked about during the daylight hours of Ramadan. The insertion of part of the glans does not invalidate the fast of the man. It invalidates the fast of the woman according to the opinion that the fast is invalidated by the insertion of anything into the cavity. There is no expiation (kaffarah) for the woman in this case, even if she was compliant, due to the glans not being fully inserted. If semen is discharged as a result of this act, the fast is invalidated. Intercourse during the daylight hours of Ramadan is forbidden and invalidates the fast, even if there is a barrier.