Saudi Arabia's oil deal with Russia is now 'more fragile than ever,' analyst says  CNBCThe two countries have attempted to raise prices by agreeing supply cuts while at the same time the U.S. has increased output. Read more https://www.cnbc.com/2 …

CNBCBrent crude breaks $80, its highest since 2014, as oil market tightensCNBCBrent crude breached $80 a barrel on Monday — its highest level since November 2014 — on the back of a tightening oil market and OPEC leaders signaling they won't be immediat …