Ruble Jumps Most This Month as Companies Buy Currency to Pay Tax

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The ruble jumped the most this month, bolstered by monthly tax payments, even as a software glitch halted currency trading at the Moscow Exchange for more than 2 1/2 hours.

The ruble appreciated 0.3 percent to 31.6800 against the dollar by 7 p.m. in Moscow, the biggest gain since Nov. 1. Trading stopped at 3:58 p.m. in Moscow.