If you carry one of these, you are a combatant and not a civilian. Which does mean that you have the same status as a regular soldier under the Geneva conventio

If you carry one of these, you are a combatant and not a civilian. Which does mean that you have the same status as a regular soldier under the Geneva conventions. And while soldiers and combatants are legitimate targets in general, this war is not legitimate. It is a war of agression against a sovereign country, so you cannot really claim that killing soldiers is simply legal here. The responsibility for all the death and suffering caused here lies with Putin who commanded this invasion. But as Russia is bombarding cities with civilians already, and it is likely they will escalate these bombardments even further, you are anyway in very real danger of getting killed as a civilian.