How to redirect RSS feeds?

Question

RSS

Hello! Tell me if it is possible to implement the following!
There are two sites I'll call them site.ru and domain. com both on wordpress, site.ru has an RSS feed and sends news to rambler; news on domain.com has an RSS feed and sends news to Yandex news. The desire to stop the domain.com site with or without deleting files, to glue two domains into the main one to make site.ru, but this is not a problem, how to make the domain.com feed give news from site.ru without visible changes in the address in Yandex news? With the preservation of the old tape giving news to the rambler on the website site.ru! I would be grateful for any hint!