I need to setup Helvetica font on website, downgrading to other similar fonts when helvetica not available. Fonts mast contain cyrilyc. Must be system font, and work on all systems.
I dont known is SF Pro contain cyrilyc. It even prefered then helvetica.
Please help to find all similar system fonts on all OS/device.

body {
font-family: "SF Pro", "Helvetica CY", "Arial", sans-serif;

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