The story is about a war in a world setting. This means that there are people of various ethnicities, religions, and nationalities involved in the story. It's accepted that many of these characters do not speak in English, but the story is presented in English with only a few phrases in other languages, mostly Russian. There are additionally a few Russian words scattered throughout the story. In most cases, these words and phrases are explained simply because of the text and setting, but it's left to the reader to determine some of those. A more serious issue is the number of people involved. While some are American with at least reasonably common names that are easily remembered, there are many Russian officials serving in various capacities. Both the complexity of the names and the fact that the situation may be unfamiliar to some readers could make comprehension difficult.