LONDON, March 24. /TASS/. The price of Brent crude oil futures contracts for May delivery fell by 1.4% to $39.9 per barrel in the course of trading session on London Stock Exchange. Against this background, the ruble weakens. The dollar rose by 39 kopecks to 69.12 rubles on the Moscow Exchange, the euro - by 40 kopecks to 77.21 rubles.