Go here: https://www.russiadefence.net/t2609-how-many-types-of-r-27eridan wrote:I can't find any info from reliable websites (producers, exporters, users, etc) about new batches of r27 missiles, designed in 2000s or later, and produced and fielded since. for r-73 and r-77 there ARE news about new batches and versions, making the whole question even more peculiar.
Perhaps it's possible the fielded r27s are still 1980s designs that are continually being refurbished, but are otherwise technologically some 25+ years old.
Either way there are still plenty of advanced variants, and even the original still does its job well. Heck, the US still uses the 60's designed Sparrow!