I'd never heard of sunflower seed halvah, but it makes sense. It probably wouldn't be quite the same texture, but both are seeds high in oil. Poking around the web, it seems this is the Eastern European stepchild of real halvah. I found one site selling it which wasn't in cyrillic: http://parthenonfoods.com/sunflower-seed-halva-450g-p-609.html?manufacturers_id=185