She got married without a dowry and without witnesses, and he is refusing to take her to his country
Question

                Im a muslima who live in japan. And I got married Saudi man who has wife and children in Saudi Arabia. He came here for project and he’ll be leave soon. We married without any witness and he didn’t give me mahr. Sometimes he gave me gift. I was beginner in islam. And his first wife doesn’t know about that we married here. Now on I ask him to take me to Saudi Arabia or other country around Saudi Arabia. But he told me it’s impossible. And doesn’t want my family knows what I did with you. I am really got suffering from this. He always talks to me ‘we don’t know what will be happen and I can’t make sure for future with you” What is the mean of that? What can I ask for my right to him?.
Praise be to Allah.Firstly: 
There are essential pillars 
    and conditions for marriage which must be met. That includes the guardian of 
    the woman and two witnesses. If there is no guardian, two witnesses and 
    publicising of the marriage among the people, then it is not valid. 
If only the guardian is 
    missing, then it is not valid according to the majority of scholars, but it 
    is valid according to some fuqaha’. 
If there are no witnesses, 
    but it is publicised among people, this announcement is sufficient according 
    to some scholars. 
The guardian of a Muslim 
    woman must be a Muslim. Her guardian may be her son if she has one, then her 
    father, then her grandfather, then her brother, and so on among her 
    relatives on the father's side, the closest then the next closest. If she 
    has no Muslim guardian, the Muslim judge may conduct her marriage if there 
    is one, otherwise the head of the Islamic centre and the like may conduct 
    her marriage, or a man of good character among the Muslims may conduct her 
    marriage with her consent. 
The woman must have a dowry 
    even if it is little. If the dowry is not mentioned in the marriage 
    contract, the marriage is valid and she is entitled to a dowry like that of 
    her peers, meaning that she is to be awarded a dowry that is equal to the 
    dowry of her peers among women in her country. 
Whether your marriage is 
    valid or invalid, the dowry is your right and if you have a child he is to 
    be attributed to his father. 
In the event that the 
    marriage is invalid because there was no guardian or witnesses or 
    announcement, you have to keep away from this husband until a new and valid 
    marriage contract is done. In that case the marriage must be documented and 
    registered in the Saudi embassy in your country, so as to guarantee your 
    rights and the rights of your children in the future. 
Secondly: 
The husband is obliged to 
    provide suitable accommodation for his wife and to spend on what she needs. 
    He does not have the right to leave her in a country where she is not safe, 
    and he does not have the right to be away from her for more than six months 
    except with her consent. If he has finished with the purpose for which he 
    came to the country in which he got married, whether it was business or 
    study or anything else, and he wants to go back to his original country, 
    then he must take his wife with him and at least provide her with 
    accommodation in another city, other than the city in which his first wife 
    lives, until he has the chance to tell his first his first wife about his 
    new wife. 
If he refuses to give her 
    her rights or take her with him, and he wants to leave her in her country 
    where he married her – for longer than the period that we have mentioned -- 
    and she does not agree to that, then she has the right to ask for divorce. 
What we advise Muslim women 
    who live in countries like yours and what we advise their guardians also, is 
    not to rush to do and take their time before agreeing to any marriage, and 
    to find out precise details about the situation of any stranger who wants to 
    marry their daughters and is living in their countries for any purpose, 
    whether it is for study or business or tourism and so on. Many of these 
    people, very many, are not serious about marriage and they do not want to 
    take a solemn covenant on which to build a family; rather all they care 
    about is fulfilling their desire right now, then when they have finished 
    with their business they leave the country and they leave behind a wife and 
    maybe children too, if they have children. “and 
    Allaah will inform them of what they used to do” [al-Maa’idah 5:14]. 
And Allaah knows best.