Are foreigners allowed entry into any country?
Whether foreigners are allowed entry is decided by the individual country.
It is absolutely the scope of the sovereignty within a country whether foreigners are allowed entry.
What certificates and procedures does a foreigner need to enter a country?
Generally speaking, passports and visas are needed while entering a foreign country.
On some occasion, on the basis of reciprocity, some countries allow entry of foreigners without visas through agreements.
In order to protect legitimate interests, a country has its right to refuse entry of some kind of people.
What regulations do we have in terms of refusing entry into another country?
Generally speaking, such kind of people is not allowed entry into another country as psychopaths, infectious people, criminals and people who are in illegitimate occupation.
The restrictions on entering a foreign country should not act against the fundamental principles of International Law.
Different countries have their unique regulations on entry into their countries.
Are there any regulations about residency of foreigners after their entry?
In accordance with the laws in the host country and relational international treaties or agreements, foreigners can obtain long-term, short term or permanent residency.
Foreigners who can not obtain long term residency before he or she asks for and gets permission.