As a Belorussian-American, I can’t tell you how many times I have been asked this question. A lot of people in the US only know of Russia and if they heard of the other three countries they really don’t really know much about them.
Russia, Ukraine, Belarus, and Moldova are all countries that used to be or the USSR. In 1991 all of these countries became independent from one another. Before communism, all of these counties were ruled by the Tsar. Because Russia, Ukraine, Belarus, and Moldova were all under the same government for so long the counties and the people are very much alike. Being from Eastern Europe and traveling through all these countries I could tell you that the only thing that divides them other then the borders and their pride are the languages.
Ethnically, most Eastern Europeans are Slavic people. They share the same facial features. Culturally they are the same as well, with the same customs, religion, tradition, and food. Out of the four, Moldova is the most different. It has a completely different language that is more similar to Romanian then Russian. However, most Moldavians can speak Russian. Moldova also has a more distinct culture. Ukraine and Belarus also have their own languages, however, they are very similar to Russia. The languages could be described as a mix of Polish and Russian.
These four counties have a lot on common, however, after being united for so long these people are desperate to differentiate themselves from each other. Today they are trying to build their own identities and unique cultures.