According to official requirements, the passport must be valid for at least 6 months, but not from the date of return, but from the date of filing an application for the opening of a visa. From practice: visas are opened, if there is at least 3 months, and there are never any problems with entry on the border.

In the UAE, despite the formal requirements of the semi-annual validity of the passport after the completion of the trip, in practice there are no problems with a document valid for 3 months after the return. Visas are issued, and no one unfolds on the border.

As for general practice, if the validity of the passport is less than what is required to visit the country you need, it is recommended to change it, as the visa can not give .But even if the visa is given (or it is already open), there may be problems at the entrance to the country, that is, at the border control .In this situation, for the most risky travelers, there is an option to go all the same, but to insure against travel and, for the most sensible ones, either to go to countries where you can go with your current passport (as an option - where even more loyal border guards), or urgently change your passport .