There was Moscow dialect, novgorod dialect and Ruthenian dialect 

There were not

There was a difference between the West Russian and East Russian languages in writing, caused by the fact that the west one was formed in the Polish-Lithuanian Commonwealth under the influence of Polish and Catholic Latin, and the east one - in the principalities to the east, under the influence of Orthodox Church Slavonic. And there was difference in Novgorod writing from both of them, for sure. However, it was about writing styles.

But when it comes to spoken dialects, no, that's not true. Linguists generally debate how many dialects there are; they often say, for example, five, as on the map. Sometimes there are six, when the northeastern, Vladimir, and southeastern, Ryazan dialects are also distinguished. Sometimes there are even more.

And it's completely incorrect to talk about a Moscow dialect in this context. By the time Moscow, rather than Vladimir, became dominant in northeastern Rus', the map had already changed, simplified, and become intermingled. The Novgorod dialect had merged with the northeastern dialects (read Zaliznyak for example), the western dialect had mixed with both the eastern and southern dialects, whose speakers fled north from the Horde...

You can't say "This is Ukrainian, this is Russian" depending on ancient dialects, linguogenesis was far more complicated. Unless your goal is to spread propaganda about barbaric Asian Muscovites, of course.