WASHINGTON, May 23 (TNSLrpt) -- The Congressional Research Service issued the following Insight white paper (No. IN12534) by Russian and European affairs specialists Andrew S. Bowen and Cory Welt. Here are excerpts: * * * Russia's War Against Ukraine: Diplomatic Talks and U.S. Policy The Russian Federation (Russia) launched a full-scale invasion of Ukraine in February 2022. More than four years later, Russia and Ukraine remain engaged in Europe's largest war in scope and scale since World War II. With estimates ranging from up to 1.3 millio more PR