Something very similar in east..
Russian TU 144LL
Tupolev-144LL is a Flying Laboratory. LL means
Letayuschchaya Laboratoriya, i.e. Flying Laboratory. Even Ilyushin-76LL is a Flying Laboratory version of the venerable Ilyushin-76, and is used by
Gromov Flight Research Institute to test various aviation engines, including the Indian Kaveri.
Tupolev-144 was the world's first SST (Super-Sonic Transport), i.e. first supersonic airliner, made by the USSR.
Tupolev-144
Later, after services were discontinued, one Tupolev-144 (registration no: RA-77114) was converted to a research platform for Tupolev/NASA tests, and it was renamed Tupolev-144LL:
Tupolev-144LL
Here is a picture of the Ilyushin-76LL testing India's Kaveri Engine on the port side, closer to the fuselage:
Ilyushin-76LL of Gromov Flight Research Institute.
Link:
Tupolev Tu-144 - Wikipedia, the free encyclopedia