Crude oil futures have jumped to the highest levels in six weeks after U.S. President Donald Trump ratcheted up threats to slap Russia with extra sanctions and tariffs unless it agrees to a ceasefire with Ukraine. Brent crude for September delivery gained 1.2% to trade at $73.34/barrel in Wednesday’s morning session, while WTI crude was up 1.5% to $70.24. Trump told reporters that he would give Russia 10 more days to negotiate a truce with Ukraine, extending his earlier deadline to August 3 from July 14. Trump says he is not concerned about…