Under what grounds can a marriage be declared invalid?

Recognition of marriage as invalid can only be established in a judicial proceeding. The reason for this conclusion may be the claim of one of the spouses, the prosecutor, the guardianship authority or interested third parties. Recognition of a marriage invalid entails the automatic cancellation of mutual rights and obligations that arose from the moment of its conclusion.
The grounds for invalidating a marriage may be:
• violation of the principle of monogamy;
• fraud, threats applied in marriage;
• incapacity or minority of the person entering into marriage;
• marriage to a close relative;
• conclusion of a fictitious marriage (in order to obtain a residence permit, the right to housing, etc.).

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