Dollar rings up largest weekly gain against ruble in 6 weeks

The dollar recorded a 10.5% weekly gain against the ruble Friday, its largest in six weeks, as West Texas Intermediate crude extended its decline — dropping as low as $57.34 a barrel, at one point.

The buck also gained 3% against the Norwegian krone, 1.18% against the Canadian dollar and 2.6% against the Brazilian real in the past week.