You need Google Wear OS 2.2 and higher (not Android Wear OS, it's different and not supported). And your phone must have Google services installed!
If you bought Strelok Pro not in the Google store, then the watch module is not included to the installation package. Here is workaround:
Download apk file for the watch here
Use this app to install apk to the watch : https://play.google.com/store/apps/details?id=eu.sisik.hackendebug&hl=en&gl=US
Use this video to install apk to HUAWEI WATCH 4 PRO: https://www.youtube.com/watch?v=I6Qlm9M8ZpM
Useful videos:
https://www.youtube.com/watch?v=5v8_pGVyPBs
https://www.youtube.com/watch?v=AwoH-9o_w3k
https://www.youtube.com/watch?v=LE6fm4Ejji8
Note: the watch app must be open and screen on to communicate. When successful the watch will chime
On the watch you will see reticle image in 1.0 scale. Make double tap on it. Reticle image will be enlarged twice and zoom mode will be turned on. You can zoom in and out in this mode and move reticle as you want. Double tap again to return to 1.0 scale. You can make long tap on reticle image to clear it. Also can make long tap on the table to clear it.