(Reuters) – Any encroachment on the Crimea peninsula by a NATO member-state could amount to a declaration of war on Russia which could lead to “World War Three,” Russia’s former president, Dmitry Medvedev, was quoted as saying on Monday. “For us, Crimea is a part of Russia. And that means forever. Any attempt to encroach on Crimea is a declaration of war against our country,” Medvedev told the news website Argumenty i Fakty. “And if this is done by a NATO member-state, this means conflict with the entire North Atlantic alliance; a World War Three. A complete catastrophe.” Medvedev, now deputy …