MOSCOW — Ousted Ukrainian President Viktor Yanukovich, who fled to Russia a year ago after being toppled by months of street protests, said he was ready to return to Ukraine if the opportunity arose. The pro-Russian leader was overthrown by the "Maidan" uprising in Kiev against his decision to back away from a deal that would have taken the country towards integration with Europe and instead tighten economic ties with Russia, Ukraine's old Soviet master. Just weeks after his departure, Moscow annexed the Crimea peninsula, a base for Russia's Black Sea fleet, and pro-Russian separatists seized key buildings in the...