When ISIS Releases Indian Nurses From Captivity

With no diplomatic ties, India was able to save 46 nurses from the grasp of ISIS through negotiations

An American solider with ISIS flag. Source-https://upload.wikimedia.org/wikipedia/commons/4/40/U.S._Army_soldier_with_captured_ISIS_flag_in_Iraq%2C_December_2010.jpg

It was the city of Tikrit in the middle of Iraq. In a hospital, 46 Indian nurses were stuck and under the captivity of ISIS fighters. Who could save them from the fighters? Could diplomacy save them?