How to find stolen iPhone?

Hi)everyone!!! I’m from Ukraine, and if you know we have war there, unfortunately!!! So the Russian soldiers still my 7plus, I just had left my box with IMEI so how I can find it coz all my information was there ( I’m not sure that I safe a lot on iCloud coz memory was 256gb) if any possible to see the location of the phone or to block it completely?

[Re-Titled by Moderator]