Brian, there are hundreds of web links that will give you bits and pieces of the 2014 timeline. Better you start reading dead tree accounts, and so far the best narrative I've come across is historian Timothy Snyder's
Road to Unfreedom The fascist clique here will excoriate him for being a Yalie, but he IS the real deal as a historian on eastern and central Europe. Speaks Russian, Polish and Ukrainian fluently, lives and teaches in Vienna, conducted hundreds of interviews for the book, (which has 60 pages of footnotes, nothing made up or hidden). Far, far better informed than any internet reporter.
That said, if you don't do dead tree books then Wikipedia for all its' faults has a reasonable bare-bones summary at
https://en.wikipedia.org/wiki/Little_green_men_(Russo-Ukrainian_War)