Speaking of Russia, this is a story I’ve been following closely, from Tyler Rogoway and Ivan Voukadinov at The Drive:
The MiG-31, which evolved out of the MiG-25 Foxbat, has the ability to carry heavy loads to high altitudes and at very speeds approaching mach three. This makes it an ideal launch platform not just for ballistic missiles meant to strike targets on the surface of the earth, but also for small suborbital or even orbital payloads, and especially direct-ascent anti-satellite weapons. On September 14th, 2018 what appears to be just such a launch system was photographed at Zhukovsky Airport outside of Moscow by aviation photographer ShipSash.
Definitely spend some time with the incredible photo and analysis of the hardware.