Ukraine has not been "invaded". Notice they're not complaining about the violation of the treaty.
Why do you think Russia is there?
Do you think Russia is "invading" all of Ukraine? No, they're not. They defendind the Ethnic Russians who comprice the overwhelming majority of east Ukraine. That tiny part of the country is the only place the Russians are, and they're there saving lives.
Ukraine has been in a civil war for over a decade.
The US has pumped billions of dollars into a rar right regime that have killed hundred of thousands of people in that country in the past 15 years or so.
The US poisined the elected leader of Ukraine, replaced him with a puppet, the got a contract frack all the country. East
Ukraine doesn't want to be turned into Detroit. Their choices are agree or be killed. Russia is not the bad guy here. It's just another US petrowar. If you think the media is reporting this skirmisg fairly and objectivrley, you might want to check your sources.
Sorry, that's US petrodollar propaganda.
The US is not the good guy here and Russia is hardly the bad guy.
Things they left out:
1) The US effected regime change, using banned chemical weopans to eliminate the previous duly elected leader of a soverign state.
2) Then they installed a US puppet as a leader.
3) Chevron was then awarded a contract to frack all of Ukraine.
4) Crimea objected to being turned into Detroit and asked Putin to rejoin Russia (note that Crimea was part of Russia but given to Ukraine when the USSR broke up.l
5) Putin said no.
6) Crimea held a referendum and voted 96% to rejoin Russia in an EU monitored election. The ony observed election interfernwvce was form thew US.
7) East Ukraine is Russan and use to be part of Russia. Western Ukrain is Ukranian.
8) Since 2014 there has been a civil war in Ukraine, the east wants to leave and rejoin Russia and does not want to get fracked into being Detroit.
9) The US will lose a lot of gas revenue if this happened, so they're ethnucally clensing thew Russians. By paying Nazis.
10) Putin is preventing Nazis from killing Russians in the Russian part of Ukraine.
References:
Assistant Secretary of State for European Affairs Toria Nuland was the mastermind behind regime change in Ukraine
http://truthout.org/articles/the-ukraine-mess-that-nuland-made/
"REUTERS - New Ukraine leader gives Chevron a contract to frack all of Ukraine"
http://web.archive.org/web/20131107222333/https://www.reuters.com/article/2013/11/05/us-ukraine-chevron-idUSBRE9A40ML20131105
CIA: Undermining and Nazifying Ukraine Since 1953
https://off-guardian.org/2016/05/14/cia-undermining-and-nazifying-ukraine-since-1953/
"Crimea Votes to Secede From Ukraine"
http://www.nytimes.com/2014/03/17/world/europe/crimea-ukraine-secession-vote-referendum.html
"observers to the 2014 Crimean referendum included members of the European Union's parliament"
http://en.wikipedia.org/wiki/2014_Crimean_status_referendum#Observers
"Referendum Monitor Criticizes U.S. Involvement in Crimea"
http://www.nbcnews.com/storyline/ukraine-crisis/referendum-monitor-criticizes-u-s-involvement-crimea-n53646
Seven Decades of Nazi Collaboration: America’s Dirty Little Ukraine Secret
http://www.thenation.com/article/seven-decades-nazi-collaboration-americas-dirty-little-ukraine-secret/
It's not Russia that's pushed Ukraine to the brink of war
http://www.theguardian.com/commentisfree/2014/apr/30/russia-ukraine-war-kiev-conflict
Human right groups insist Israel stop arming Nazis in Ukraine
http://www.haaretz.com/israel-news/rights-groups-demand-israel-stop-arming-neo-nazis-in-the-ukraine-1.6248727