Russia is warning of "serious consequences" after Ukraine's new President signed a trade and economic agreement with the European Union.<br />Al Jazeera's Paul Brennan reports from Donetsk, in Eastern Ukraine. <br />Subscribe to our channel http://bit.ly/AJSubscribe<br />Follow us on Twitter https://twitter.com/AJEnglish<br />Find us on Facebook https://www.facebook.com/aljazeera<br />Check our website http://www.aljazeera.com/
