nonexplosive war heads. why? it is an effort to exhaust ukraine air defenses as they try to shoot them down and flood the zone. this is a fragment of the kh-55 missile which is nuclear capable that the ukraine government put on display. matthew chance joins us live from kyiv. what are we learning about these warheads and are there any weight to the possible withdrawals here? reporter: well, it is an interesting development, isn t it? the idea that the ukrainians are now saying that the russians who have been bombarding various infrastructure installations across the country are using dummy missiles, cruise missiles from the soviet era, the kh-55s that are armed with a nuclear warhead. those have been taken off and fired with no explosive at all. the sheer kinetic impact and the fuel on board the cruise