Thank you very much. Your solution works smoothly.
I found one strange issue, it doesn’t bugs my sites anyway but i am curios to find why it’s happening. Firstly i changed all my files and directories to root ownership and attached them to root group. It did’t fix the issue.
But when i changed everything back to previous user and group stack, granted full admin rights to this user threw Plesk interface that fix the issue.
Maybe you know why root not working as expected?