You can’t expect your military officers to be treated with the rights of neutral observers, when your country is not neutral.
“You can’t expect your military officers to be treated with the rights of neutral observers, when your country is not neutral.”
That is a totally false statement. There are innumerable instances of diplomatic and/or military officers from belligerents in declared wars being accorded immunities and permissions to observe and inspect their enemy’s territories and/or forces for mutually agreed purposes. It is a common practice.