Sure, but it's much easier to enter Germany from Ukraine (and currently also Moldova and Belarus, but they have a smaller population), as you won't need a visa and special work-permit, as you would from Russia, Serbia or Turkey, so it's more common to have Ukrainians working in Germany than Russians. EU-citizens have an easier time still, so they make up the lion's share.

The "employer provides accommodation" is common in farming (seasonal work) and some factories, e.g. industrial slaughterhouses are well known for that kind of setup, and for bad conditions.