There are no Russian developers actively working on the core of SSH / openSSH.
There are, however, Russians who develop substitutes for crypto components (for SSH) to get around import / export restrictions.
In 2024, all known Russian programmers were removed as maintainers of Linux Kernel modules, by the Linux Foundation, in response to an executive order from President Biden.
There are also import / export restrictions in place with China (around encryption, AI, and other tech).
The legal implication is that *several* open source projects (and organizations) are in violation of (often *many*) such laws.
Some times this bites those organizations in the back side (I’ve been in one company that struggled with this relating to China for quite some time). Other times it simply gets ignored by all parties (and all governments).
An important rule of thumb: If you are a USA based entity (individual, non profit, corporation, etc.), you need to be careful when working with China, Russia (and a few others) on open source projects. Even accepting a single, small code submission can be a legal problem.
There have been Russian ssh developers since about forever.