Labour immigration is not really a problem as long as the people in question WORK which no doubt people from Russia would do.

The balance between East / West / North / South is working quite well in the EU right now.
The problem are with non-Europeans and with that I mean Africans, Middle East people who have a different culture and are not able to adapt or learn the language.

The problem is the people who don't work but live on welfare and have large families who also need to live on welfare, etc etc. "Refugees" for example are not allowed to work until the issue about their refugee status is resolved. This can take many YEARS. In the meantime, the country where they are is supporting them financially while they do NOTHING apart from maybe attend some (free) language classes. Once the refugee claim has been investigated, most of the people are NOT refugees and are told to leave. In the case of Sweden etc, where you can not really live without documents of your identity, they usually leave. But in England and some other countries that are not strict with documentation, the people simply stay on illegally instead. This is also bad because they are living in the twilight economy, exploited and illegally.

As for people from ex Soviet countries, there were plenty of problems with crooks from the Baltic countries in Scandinavia in in the 90s, but this has reduced I think. Now instead, I have read that there are people from Uzbekistan who make it to Scandinavia (land route - the border Finland - Russia is apparently quite porous. Finland won't have anything to do with them, so they continue to Sweden.) They claim political asylum, i.e that they are dissidents, persecuted etc. Not sure what the situation with this really is.

The only Russian speakers I have met in Sweden are smart and hard working people in professional type jobs. In the 1990s there were some problems with criminals but that has stopped now.

In the UK there are lots of really rich Russians living. Not sure what they actually DO in the UK, but I have seen them in expensive shops and restaurants. The only other Russians I have met in the UK are programmers.

I have no idea what kind of Europeans go to Russia and work.... I think perhaps workers in multinational companies, language teachers, perhaps people involved in voluntary work. Can't imagine they'd be much trouble either.