It looks like the question about the legality of acquaintances with the girls from the Ukraine through international marriage agencies are the most popular. The main feature and a priority of famous international marriage agencies are that there are no risks neither for men nor for women; they will not face an awkward situation. This is the easiest and a great way to meet interesting and nice people. But it is important to meet a proper agency.
Although sometimes it happens that after several nice letters women make decisions to visit men in their countries (or other foreign countries) without knowing their language and culture and as a result they come into sexual or labor slavery ... because their the potential grooms are pimps and sadists. Tragically, some dating agencies are channels of human traffic. At best, these women will be able to return home, in the worst - their relatives will never know what happened to them.
To avoid these negative situations you need to carefully learn more about the activities of marriage /dating agencies, the duration of their stay in the market, the success of the happy marriages, the number of brides in the database. And also as well, the respectable agency has a physical office with a staff psychologist, they will not offer their clients professional photo sessions and they will work with the materials provided by women, sometimes they can provide recommendations for photos on their website, etc.
After the adoption of the law about international marriage broker regulation act (IMBRA) in 2005 in the United States all the international marriage agencies that work through marriage sites have to register users mandatory, requiring them to complete information on their mental health, about previous marriages and the reasons for divorces, about children under 18 years, about their criminal background. Potential grooms must fill out a special IMBRA form and send it to the agency. The agency starts processing the data for a fee. Only after that a man can begin to communicate with the ladies. Usually, the process takes three business days.
This law is unfortunately so far the only one in the USA. But Canada, Australia and Britain are planning to adopt such a regulation in a nearest future too.