Territorial expansion is 10-19th century politics. Nowadays, there are nations rather than empires. The powerful states of the world place loyal (vassal) governments in other nations. But they don’t incorporate new territories instilling English, American, French or German worlds respecting sovourngities of smaller nations.
Russia is a largest state that has many territories, resources and people. Combined population of Lithuania, Latvia, Estonia is smaller that of Moscow city. Most countries of Europe gave up imparialistic politics except for Russia. Political development of Russia is stuck in 19th early 20th century. Russian political elite is living in the past.