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The law usually does not prohibit it (maybe the Russian Federation is an exception, I do not know).�
From the point of view of genetics, this is normal. Siblings (brothers and sisters) 1/2 of the shared genes. Cousins (descendants from different siblings) – 1/8. For second cousins (descendants from different cousins) – 1/32. When second cousins are married, the probability of a descendant showing a specific harmful recessive mutation that one of the sibling parents had is even 4 times less (you need to get a mutant variant from both parents). That is, 1/128.
For comparison: when cousins are married-1/32 (and this is allowed in most countries). When a brother and sister are married-1/8, parents and children-1/8, native uncle and niece (nephew and native aunt) – 1/16 (these options are usually prohibited as incest).�
But if you marry relatives (even if not very close) from generation to generation, then genetic diversity will fall and recessive mutations will certainly appear.
In general, you can marry anyone, even your own brother. The main thing if you want to have common children is to check with a doctor for the presence of common recessive genetic diseases and if they are not present, then there are no problems, and if there are, then the children in your family will be exclusively adopted.