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D. Nemtsov was planning to lead a Moscow protest against the war in east Ukraine, where pro-Russian rebels have seized a swathe of territory. From northwest to southeast, Russia shares land borders with Norway, Finland, Estonia, Latvia, Lithuania, Poland, Belarus, Ukraine, Georgia, Azerbaijan, Kazakhstan, China, Mongolia, and North Korea. It shares maritime borders with Japan by the Sea of Okhotsk and the U.S. state of Alaska across the Bering Strait.
A. The Caucasus is a region at the border of Europe and Asia, situated between the Black and the Caspian seas. The northern portion is part of the Russian Federation. In addition to western agents, Russian authorities have suggested Islamic terrorist or other dissidents may have killed Nemtsov. What they have not suggested is that he may have been killed for opposing Putin.
B. Alexander Litvinenko died in 2006 nearly three weeks after drinking tea laced with polonium in a London hotel. He was reported to have fallen out with Putin in the late 1990s over corruption in the spy agency that was then headed by Putin. At least four other Putin critics have died in Moscow since he rose to power in 2000.
C. Just over a year ago the Russian Federation annexed the Crimean Peninsula in the Black Sea. After several western nations imposed trade sanctions on Russia, that nation responded with sanctions against them. Combined with a big drop in oil prices, all the sanctions have contributed to the collapse of Russia's ruble currency.