So I want to be upfront and say I don’t really agree with their argument, but I do understand it. What Russia and China are saying is by tying the ceasefire to the release of hostages is unfair to the Palestinian side. This is because they lose all leverage and then would be easy targets for Israel who doesn’t seem to mind bombing Palestinian civilians.
My issue is that technically the only reason their bombing is because of the hostages and perhaps if they release the hostages peace talks can begin. The opposite of that argument is it will allow Israel to be even more aggressive after the temporary cease fire is ended.