No visa for the countries of the European Union: valid identity card or passport.
With the Romanian identity card; also possible with a passport.
It is not possible.
An identity card is sufficient for a Romanian citizen.
No, because Montenegro is not a member of the European Union.
No, you need a valid passport.
An identity card is sufficient.
For a Greek citizen: identity card or passport.
of course you can, Poland and United Kingdom are in European Union, so the passport is not necessary, polish ID or british ID is totally fine
All Pakistanis do have a National Identity Card (NIC) and they are required to carry it around whenever they travel.
Yes, You always need a passport (or EU national identity card) to get in our out of the UK.
No you cannot enter without a valid Romanian Passport