yes most modern destroyers have foreign parts,
like the radar and weapon systems of Japanese Kongō-class and Atago-class
and Sejong the Great-class for South Korea, or the Type-45's VLS
but Kolkata's case is very different from those, as all the core parts are foreign made, it took more than a decade to put up a half baked foreign parts assembled ship, and with all the available foreign assistants yet that ship still soaking in the water, this shows india has very low technological know-how of building modern warships...and also due to the primitiveness of india's technological and engineering skill, there is a big question mark on whether all of these different equipment and systems (from other countries) will be working effectively and compatibly`
so the problem is when you leave out three very advanced and potent destroyers like Sejong the Great-class, Kongo-class and Atago-class, and put this questionable half-finished Kolkata in, it becomes ludicrous, and so are those funny Indian delusions