Re: Fallen soldier identification
Is it not against the Geneva convention to publicly identify fallen solders ?
Article 4 of the 1929 Geneva Convention indicates that combatants should strive to identify and report deaths. Subsequent Geneva Conventions say the same thing. [Ref. 1] So, the Ukraine's claim of doing this to alert parents is legally correct, if non-traditional. Given the Ukraine's likely additional motivations of trying to demoralize Russians, the matter's more questionable.
On that note, the Washington Post (among others) is arguing that showing the bodies of fallen soldiers violated the Geneva Conventions' requirement to protect POWs from "insults and public curiosity." The idea behind this clause was that POWs shouldn't be paraded through streets where they could be beaten, humiliated, showed with unpleasant materials, etc. This clause pre-dated widespread photo journalism and TV broadcasts, leading to the UK's guidance for journalists [Ref. 2]. The general idea is, "Don't show living POWs, particularly if their dignity is compromised." The US raised a fuss about the 2016 incident where Iran captured sailors and released images of them [Ref. 3]. The Ukraine's release of videos of Russia POWs earlier in March falls afoul of this rule.
However, most material on "insults and public curiosity" emphasize treatment of the living. The Geneva Conventions' guidance on bodies of the dead is more nebulous with respect to sharing photographs [Ref. 4]. The Conventions are pretty clear that fallen soldiers' bodies should not be mutilated and should be treated with dignity. It's likely that someone could formally object to the Ukraine's use of Clearview and alerting (or taunting) parents of fallen soldiers as a violation of the bodies' dignity.
Note: my search was not exhaustive so I might've missed precedents where photographs of the dead constituted a war crime.
 International Red Cross's position on identifying war dead
 UK's interpretation of insults and public curiosity
 Captured US sailors: legal implications
 Treatment of dead soldiers