Дякую за гарне видиво.

That is not a Ukrainian-core tradition, it is a Romanian tradition. In present-day Ukraine, it seems to be met only in territories that were grabbed by USSR from Romania in 1940. In Romania you can witness Malanka (under this name or with variations) all over the country. A interviewed lady mentioned that is something common in the Balkans ... which are far away from Ukraine. Also, one mentioned Hutsuls - which are not core-Ukraine. In North Bucovina there are a lot of Ukrainian villages which used to be Romanian. Ukrainization occured thru both colonization and acculturation, but people preserved their old rituals even where they changed their language. In this very video, while the presenter was telling about "Ukrainian culture" the lads in the background images were carrying their traditional Romanian tricolor (red-yellow-blue) and were chanting in Romanian language. Being a Romanian cultural phenomenon, of course it is also met in the Republic of Moldova (where 80% are ethnic Romanians). Well, I guess such mutual influences are only normal. Cheers!