Just to add to what yuneeq is saying, when someone is rescued from Ukraine, they are usually leaving with the clothes on their back. Literally. It's hard for us to fathom what being a "refugee" means, but this is what's happening.
One Shliach had to leave so fast, he didn't have time to get his tallis and tefillin.
Now is not the time to start parsing what is or is not pikuach nefesh. All we can do is pray and give. Let's do that and worry about the questions later. In a year, I'd love to learn a pilpul on when a refugee switches from pikuach nefesh to an ani.