Far as I know, at the time these ships were contracted (Batch-1 Talwar 1997, P-17 Shivalik 1999, Batch-2 Talwar 2006) it was the only system available. It was only in the 2010s that the VLS version of 9M317 SAM emerged on the Admiral Grigorovich class (improved Talwar/Krivak). Batch-3 & 4 which...