Light missiles like the Kh-23 Kerry and Kh-25 family of 300kg weight class missiles with 90kg warheads were designed for lighter aircraft like the Su-17 and MiG-27 families.
The heavier missile then was the Kh-29 with a 320kg HE warhead, which would be carried by the Su-24, though its flight range is limited to about 10-12km.
For very long range strike against well protected targets the Kh-59 and Kh-59M offer long range with optical guidance and I suspect newer models will be developed.
The Kh-38 is supposed to replace the Kh-25 family of weapons with a harder hitting 250kg payload and 80km range in the domestic versions.
Other missiles will include the anti radiation upgraded Kh-58, plus a range of laser and satellite and other guided bombs and rockets.
Interestingly with two crew and its fairly powerful radar and a capacity to carry a large number of missiles it would be interesting to see it as a potential long range interceptor/air patrol aircraft.
With half a dozen R-37Ms plus room for several other missile types it would add a lot of fire power when enemy aircraft try to penetrate Russian airspace....