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In Ukraine, a drone with a jet engine and a flight range of 400 kilometers has been developed
(odessa-journal.com)
this post was submitted on 05 Sep 2023
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This is an ECM/reconnaissance drone, not a cruise missile. So no "target" in the normal sense (although I wouldn't be surprised if it was going to be used a cruise missile, too). And reduction of induced drag (raked wingtips or winglets for transonic; straight high aspect-ratio wings with elliptic lift distribution for subsonic) works the same at both scales. At a cruise speed of 600 km/h this is fast, but almost certainly fully subsonic, so sweep makes little sense aerodynamically, in either direction. If they were bothered about fuel efficiency, it would have long, straight, high-aspect-ratio wings, like the Global Hawk, or the Reaper, or the Predator, and a turbofan or turboprop engine.
I'm sure they're no idiots and have very good reasons for the design decision. I just doubt that the reason is aerodynamic efficiency.
The beaver cruise missile is completely different, it is a propeller-driven canard with straight wings. But that may actually be the reason: they re-used the fuselage design, and with the same wing attachment point, forward sweep was required to maintain a reasonable centre of lift in a conventional configuration. Again: a compromise for a short time to deployment. Not aerodynamic refinement.