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From there: As of September 2015, there were 2.6 million Ukrainians living in Russia, more than half of them "guest workers". A million more had arrived in the past eighteen months
[19] (although critics have accused the FMS and media of circulating exaggerated figures
[20][21]). About 400,000 had applied for refugee status and almost 300,000 had asked for temporary residence status, with another 600,000 considered to be in breach of migration rules.
[19] By November 2017, there were 427,240 applicant asylum-seekers and refugees from Ukraine registered in Russia,
[6] over 185,000 of them having received temporary asylum, and fewer than 590 with refugee status."
https://en.wikipedia.org/wiki/Ukrainians_in_Russia#Events_since_2014