Can a foreigner obtain citizenship in any European country by virtue of same-sex marriage to citizen?

Yes, same-sex marriage is recognized in various European countries, and it can serve as a pathway for citizenship acquisition. The specific requirements may differ from country to country, but generally, a foreigner who is married to an EU citizen may be eligible for citizenship after meeting certain criteria, including:

- Residence requirements: The non-EU spouse may need to have resided in the EU country for a specified period (e.g., several years) before applying for citizenship.

- Proof of marriage: The marriage must be legally recognized in the country where the application is made.

- Language proficiency: Some countries require applicants to have basic proficiency in the local language.

- Integration: Applicants may be required to demonstrate integration into the local society, which can involve factors such as economic self-sufficiency, participation in community activities, and knowledge of the country's history and culture.

- Good conduct: Applicants should have a clean criminal record.

It's essential to note that each country has its own set of regulations regarding citizenship acquisition through same-sex marriage. Prospective applicants should refer to the official government sources of the specific European country they are interested in to obtain accurate and up-to-date information on the requirements and procedures involved.