Appropriate attribution for Yandex maps that use OSM data

I see an application and webpage called Yango, and the map they use has OSM data. It seems Yandex provides the map, but I don’t see any attribution to OSM.

How should the application attribute us?

Application map.

OSM Map.

The application has OSM data, but it has more contructions.

I can’t see that OSM data is being used. There are significant differences. Possible similarities only arise because the same things are actually present on the ground.