Russian President Vladimir Putin is risking open warfare in Europe as he tests U.S. President Joe Biden by massing troops along the border with Ukraine, a former U.S. ambassador has warned.
Russia's War Against Ukraine
Daily Mail: Former US ambassador warns Putin could bring about war in Europe
Ukrainian soldiers work on their tank close to the front line with Russian-backed separatists near Lysychansk, Luhansk region on April 7, 2021.
