Russia's Sukhoi Su-57 stealth fighter could be equipped with a hypersonic air-to-ground missile; the projectile can fit in the aircraft's internal weapon bay, which would make the fighter even harder to detect by the radars. The Diplomat reported that, citing a source in the Defense Ministry.
"In December 2018, a defense industry source revealed that the Su-57 may be armed with a hypersonic air-to-surface missile with “characteristics” similar to that of the Kh-47M2 Kinzhal (“Dagger”) air-launched ballistic missile (ALBM). The source did not provide any additional details regarding the missile. However, given the large size of the Kinzhal, the new hypersonic missile will likely be smaller given that it reportedly fits inside the Su-57’s internal weapons bay", reads the article.
The outlet reiterates that Kinzhal "is being integrated with the MiG-31K interceptor aircraft, a modified MIG-31BM", which means that Russia already uses opportunities for landing a tactical nuclear strike from the air.
"There is also speculation that the Su-57 will receive a new air-to-air hypersonic missile, an upgraded variant of the R-37 (K-37/RVV-BD) missile, capable of reaching a top speed of Mach 6 and an estimated operational range of over 300 kilometers", The Diplomat wrote, referring to a source in the Russian defense industry.