According to Art. 1217 of the Civil Code of Ukraine, inheritance is by will or according to the law.
There are five tiers of heirs to the law (Articles 1261-1265 of the Civil Code of Ukraine):
Other relatives of the testator up to and including the sixth degree of kinship have the right to inherit in the fifth line, with relatives in the next degree of kinship excluding relatives in the next degree of kinship from the right to inherit.
A period of 6 months is set for acceptance of inheritance.
Grounds for contesting a will:
Post-mortem forensic psychiatric examination can prove the invalidity of the will. It is appointed by the court at the request of one of the parties. In some cases, a forensic penmanship examination may also be appointed.
Also evidence may be written evidence, testimony of witnesses, etc.
To appeal the will there are 3 years from the date when you learned about the violation of rights.
You can file a lawsuit in court:
A will can be challenged, but only after the death of the testator and in court: