Not sure where to start?  The newest articles are up top, so scroll to the bottom of the below box to begin with the oldest chronologically.  If you want to jump ahead, while all articles stand alone, jump here or here for particularly strong starting points.  Another excellent initiation is Brian's groundbreaking eBook, A Song of Gas and Politics: How Ukraine Is at the Center of Trump-Russia, or, Ukrainegate: A “New” Phase in the Trump-Russia Saga Made from Recycled Materials (available in Amazon Kindle, Barnes & Noble Nook, & EPUB formats), of which there are excerpts found below.  There is also a section of external links to official Mueller probe, impeachment, and Senate trial documents with analysis.