flamingowings wrote:

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It is illegal to stop citizens coming back home, whoever home may be. In some cases it may take a lot of time (your normal "people") but they can't stop you entering your own country.

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 I'm afraid I don't think that's quite right, FW, or not in general (I don't know if you mean a specific country) 

It exists as a human right under the UDHR but, as elaborated on, it's not n absolute human right, it's is qualifed. Hence, as long as it's not arbitrary, there can be the normal public security, public health etc. etc. reasons that are derogations from the the normal rights. 

The ICCPR enlarges on the human rights under UDHR: 

 International Covenant on Civil and Political Rights:

1. Everyone lawfully within the territory of a State shall, within that territory, have the right to liberty of movement and freedom to choose his residence.

2. Everyone shall be free to leave any country, including his own.

3. The above-mentioned rights shall not be subject to any restrictions except those which are provided by law, are necessary to protect national security, public order (ordre public), public health or morals or the rights and freedoms of others, and are consistent with the other rights recognized in the present Covenant.

4. No one shall be arbitrarily deprived of the right to enter his own country.