Crude oil prices were on course for their first weekly decline in four weeks as the United States and Iran signaled they were willing to continue negotiating instead of escalating to a hot war. At the time of writing, Brent crude was trading at $71 per barrel, with West Texas Intermediate at $65.56 per barrel, after three weeks of gains. Brent crude has gained more than $3 per barrel over the past four weeks, and WTI is also up by some $3 per barrel. “Traders are in wait-and-see mode heading into the weekend with Iran tensions mounting on…