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 Wa  more