Specifically Russia is upsed because ABM facilities in Europe can be easily used at first strike ground attack platforms. Not that they will easily intercept few hundreds ICBMs with ease in case of big boogaloo.That would explain why Russia and China are so upset. Because ABMs don't work. Yeah, that's it.
These missiles have no warheads. They rely on impact speed. An F-35 would easily pose a greater threat in that scenario.