It is a WIG vehicle designed by E.A. Afarameyev, for the launch of a space shuttle. Some basic data: wingspan 80m , take-off weight 750t, powered by six turbojets rated at 30000-35000 kgp, and two diesels for movement on water. Separation at 30000 m. The shuttle is also supposed to land on the airborne WIG (!). In general, the system is trying to achieve landing and launching flexibility, without the need for airstrips all over the world. More discussion (but sadly, no more photos) on Sergey Komissarov' s "Russia's ekranoplans", p. 78-9.
No mention of time-frame in Komissarov's book (which is full of projects, and hence highly recommended). It would be surprising if it were before the early-late nineties. Interestingly, support of space operations is one of the missions also suggested for the gigantic Be-2500. At Beriev, they call it "Maritime Space Complex".