Помогите, пожалуйста, нужно вставить артикли, там где они нужны, и объяснить, почему

... Russia is situated in ... Europe and in ... Asia. It is washed by ... 12 seas. ... Russia borders on ... Norway, ... Finland, ... Estonia and ... others countries. It is also has ... sea border with ... Japan and ... United States. ... population of ... Russian Federafion is about ... 142 million people. It's ... ninth most populous nation in ... world. ... capital of ... country is ... Moscow