The Opinion of Rav Zalman Nechemia Goldberg and Rav Hershel Schachter

Both Rav Zalman Nechemia Goldberg and Rav Hershel Schachter maintain that once the chosson gives the kallah a ring, they are married. Whatever happens after the delivery of the ring is irrelevant in their view. (This does not mean that they endorse the practice, only that it does not invalidate the marriage.)