Hiding a few soldiers in an evacuation group, attacking russians from a group of civilians, and then blaming russians for shooting at those civilians is just one of many nasty war tactics.
What really happened, we will probably never know.
We both have just mainstream media reporting what they want us to believe, which might or might not be true. Soldiers hiding in refugee groups is a thing that has happened before, and whatever they do, it makes the other side look bad, when they shoot back.
Your claim makes no sense. Why would Ukraine want to hide soldiers in refugees leaving the country? Even if they did, then being unarmed and leaving means they’re not legitimate targets.