Over 20% of the contract military in Russia is Ukrainian. I got to see that first hand in Bosnia and the contracted airborne brigade there. Ukrainian workers are all over Russian construction sites...don't try to make crap up. Maybe in Western Ukraine its true, its a pure lie in Eastern Ukraine but then again, the nationalists don't consider anyone in eastern Ukraine "true" Ukrainian anyways.
Was I?
These are migrant WORKERS, not Ukrainian immigrants that Romanov was alluding to. Immigrants are someone who come with their kids and wives and begin the process of becoming Russian citizens. The ones currently in Russia (at least overwhelming majority) are not it, they're Gastarbeiters- time runs out, they go home.