Final answer:
The capital of Russia is Moscow, and the capital of Ukraine is Kyiv, with the latter emphasizing Ukraine's independence. The capital of Latvia, a traditional Baltic seaport, is Riga.
Step-by-step explanation:
The capital of Russia is Moscow, which was moved back there from St. Petersburg in the time after the Russian Empire became the Union of Soviet Socialist Republics (USSR). Meanwhile, the capital of Ukraine is Kyiv, formerly known as Kiev. It is necessary to note the preferred Ukrainian spelling in opposition to Russian claims, emphasizing Ukraine's sovereignty and distinct identity. As for the capital of Latvia, which is known as a traditional Baltic seaport, it is Riga. Riga has been an important hub for trade with Western Europe and operates within the Baltic states' transition to market economies after gaining independence from the Soviet Union in 1991.