Roscosmos better check their facts
"Only 30 per cent of Soviet-Russian launches to Mars were successful, the Americans have had 50 per cent success, while all attempts by Japan and Europe have failed so far"
Whether the Soviet/Russian success rate is even that high must be debatable.
Mars 1M A and B - trapped in Earth orbit.
Mars 1962A and B exploded during launch,
Mars 1 died in interplanetary space (but set a communications distance record).
Zond 1964A failed on launch.
Zond 2 died in interplanetary space.
Mars 1969A, Mars 1969B and Kosmos 419 all failed on launch.
Mars 2 and 3 both orbiters achieved their objective. Mars 2's lander crashed, Mars 3's landed and transmitted data for 15 seconds - the data is probably corrupt.
Mars 4 failed to make Martian orbit and flew by the planet,
Mars 5 a major success achieving orbit but failed in 9 days.
Mars 6 reached Mars but failed during the landing.
Mars 7 ejected the lander prematurely and missed the planet.
Fobos 1 died in interplanetary space.
Fobos 2 entered orbit, returned some imagery and was then commanded to turn away from the Earth - oops! Lander was not deployed.
Mars 96 failed on launch.
Fobos-Grunt failed to leave Earth orbit.
Meanwhile, Europe has put a very successful orbiter around Mars. If they'd like to check their receipts they'll see it was fired there by a Roscosmos Soyuz-Fregat. The Beagle 2 lander failed during descent to the Martian surface.