I keep getting emails from russians through my contact form

WpArmour

https://wordpress.org/plugins/honeypot/

CleanTalk stops 99% of such garbage messages, at least for us on our sites.

Plus, you can try this one, too: https://wordpress.org/plugins/iq-block-country/

I get some from binance as well like the one below:
Author: бнанс рестраця для США (IP address: 116.11.144.79, 116.11.144.79)
Email: [[email protected]](mailto:[email protected])
URL: https://www.binance.com/uk-UA/register?ref=VDVEQ78S
Comment:
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.

Cloudflare WAF rules > Block Russia, and most of the other neighbouring countries, if you don’t need traffic from them. Cleantalk is great too - but at least with Cloudflare that traffic doesn't even hit your server.

Which form plugin are you using? Are you implementing recaptcha? Honeypot? Like one commentator said, you could use Cloudflare WAF or through your hosting company, use web rules to block a country or countries.

Use cleantalk.org

Or for free options cloudflare Turnstile or HCAPTCHA

What forms plugin are you using?

Google recaptcha v3

Извини, друг.
Use captha.

It is hard to block them manually as they come back with new IPs. Use OOPSpam (paid) or Turnstile (free) on your forms.