My sister's ex husband who lives in Japan (he is Japanese but they got married in the UK) has never paid child maintenance; they initially had an amicable agreement that he would contribute a monthly amount; this amount was less than half of what a court would have established but fine, at least it was something. Now the payments have stopped altogether. Is there anything at all my sister can do bearing in mind that her and her DD live in the UK and her ex lives in Japan? Thanks.