Russian stocks headed for their longest streak of losses in more than a year as the nation’s biggest oil and mining companies fell on concern they may be targeted in a government drive to extract more taxes to cover a budget shortfall. Uralkali PJSC, Russia’s largest potash company, fell 2.8 percent, contributing to the benchmark Micex Index’s 0.8 percent drop. The gauge has lost almost 7 percent in the last six days, trimming its advance this year to 16 percent. The ruble traded little changed against the dollar at 66.3860 by 5:02 p.m. in Moscow. The ruble’s 50 percent devaluation against the dollar since the start of 2014 has boosted exporters’ foreign-currency earnings and Finance Minister Anton Siluanov on Wednesday said it’s time for the government to take a share of the windfall. While the ministry has proposed boosting the tax on oil companies to bring in more than […]