This week Crimea and the city of Sevastopol joined Russia. Or put another way, Russia annexed Crimea and the city of Sevastopol from Ukraine. Regardless of how we look at this, the simple fact is Ukraine lost territory and Crimea is now part of Russia. The only thing left is to make sure that the rest of Ukraine does not fall apart since the economy is in shambles and the Eastern Ukraine wants to join Russia.
Here is a fascinating time lapse video of the map of Europe over the past 100 years:
Source: Frank Reed
The map below shows the Evolution of Modern Ukraine:
Click to enlarge
Source: The Voice of Russia
Note that the map says Crimea divorced Ukraine in March, 2014. Russians have a sense of humor too.
What does Russia get economically with the incorporation of Crimea? English Russia lists 25+ things Russia gained by annexing Crimea.