MiG Corporation’s general director Ilya Tarasenko told Kommersant newspaper that his employees are busy working on a long-range interceptor that can replace the MiG-31.
By Konstantin Tyurpeko (http://russianplanes.net/id161326) [CC BY-SA 4.0 or CC BY-SA 4.0], via Wikimedia Commons
Work has started and the company hopes to have the proposal ready when the MiG-31 is due for modernization again.