In Russia, marriage contracts are not yet widespread. In Russia, spouses still use the family code. The Russian Family Code states that all property acquired before marriage is the property of each spouse, property acquired during marriage is joint property. Joint income is also considered income from assets acquired before marriage (income from residential or commercial real estate, income from business or other intellectual property, and so on). In a divorce, the joint property is divided in half. After the death of one of the spouses, his share of 50% is divided between the surviving spouse and, if any, disabled relatives: parents, children. There are also wills, marriage contracts, which can slightly change the inheritance algorithm.
I'm not a lawyer, maybe lawyers can tell more precisely.

I did not know that in Mexico they punish non-payers so severely. I like that in Mexico the law is to protect women. I don't know what the situation is in Mexico in terms of inequality between men's and women's incomes. Are there frequent cases when a woman earns more than a man? Are there frequent cases when a woman pays alimony to a man? In Russia, there is no law regulating alimony not for children, but for spouses. In Russia, there is a law on the payment of alimony only to minor children.