Commonly, a "!" in Japanese is expressed by "よ" ("yo") at the end of the sentence, but that is not always the case. よ is mainly used for exclamations that are good, but it can be sued in cases where something surprises you or things like that. As for Russian, I don't really know. Hope this helps. がんばってください。

It's not quite a literal translation, but it is better in Russian, in my opinion. The first sentence: «Меня впечатлили ваши статьи». The second sentence: «Продолжайте работать в том же духе». (it is more conversational version) or «Продолжайте работать в том же направлении». (it is neutrally)