Ukraine was hit hard by the fincancial collapse in 2008, and the EU wanted to help the ukrainians by giving financial aid but due to ukraine not being part of the EU there were some "catches" but they were pretty harmless as they just wanted some trading treaties and eventually the ukraine might have even invited to the EU, which many ukrainians wanted.
Russia however didn't want this, and pretty much threathened that if they made treaties with the EU they would stop their trading and stuff. For example "closing the gaspipes" and because the ukrainian gouvernment is pro-russian they agreed to that. However the public opinion was different, if anything they WANTED to join the EU, esp if it meant better economy,..
Riots. Under the raising pressure the president of Ukraine was pretty much overthrown but the pro-russian gouvernment asked help of Russia, claiming that ultranationalists are trying to take over the country.
Putin, who claimed that the dissolvment of the soviet union was the biggest mistake in the 20th century, ceased this opportunity to stealthy "assist" the pro-russians under the cover of protecting russian citizens in Ukraine.
There are now like 15.000 Russian troops in the Krim (crimea) area surrounding ukrainian military bases. They also moved a part of its navy near the ukranian coastal areas.
(Some of this reminds some people of the war in Georgia. They had an inside conflict and then russia invaded)
Ukraine asked the UN to stop Russia's invasion. "The West" already condemned this invasion and asked Russia to pull their troops back, but because they have pretty no leverage to use, Putin just rejected them. Currently their are many propaganda heroes(muscovites) working in the media so the russian people wants the army to invade.
Why this title?
Putin's regime is pretty much pro- soviet... if anything they want to retake all the countries and make it the soviet union again. Georgia, ukraine... what if more and more aggressive actions?
America + UN (without russia obv) putting more troops... conflicts... leading to war.... China would jump in on the Russian side... NK might take the chance to attack south korea ...
I mean... It's possible..