Identify whether the case is valid, void, or voidable then provide your reasons. Mark the keywords bold. Refer on the Family Code of the Philippines

John and Mae where Filipinos validly married in the Philippines. They went to Nevada and obtained divorce since it is valid there. The ground for their divorce is the mental incapacity of John. Subsequently, Mae, married Alexei, a Russian national, in Canada where the marriage was considered valid. Later, Mae and Alexei went to the Philippines to leave for good. Is the marriage of May and Alexei, valid, void, or voidable?