NEW YORK—Oil prices posted their first weekly gain in five weeks as rising tension in Ukraine made market watchers nervous about additional sanctions on Russia and positive U.S. economic data lifted demand expectations. Light, sweet crude for October delivery rose $1.41, or 1.5%, to $95.96 a barrel on the New York Mercantile Exchange, the highest settlement price since Aug. 20. Prices rose 2.5% this week but lost 2.3% for the month. Brent settled up 73 cents, or 0.7%, at $103.19 a barrel on ICE Futures Europe. Prices rose 0.9% for the week and fell 2.7% this month. The North Atlantic Treaty Organization said Thursday more than 1,000 Russian soldiers are fighting in Ukraine . The death toll has risen dramatically, the United Nations said Friday , with an average of 36 people killed each day between July 16 and Aug. 17 and a total of nearly 2,600 people dead […]