(Bloomberg) -- US President Joe Biden warned Israel against an invasion of the city of Rafah in southern Gaza as cease-fire talks between Israel and Hamas remained deadlocked at the beginning of Ramadan.Most Read from BloombergThese Are the Best Countries for Wealthy ExpatsOne of the Most Infamous Trades on Wall Street Is Roaring BackSlow US Inflation Retreat Is Set to Bolster Fed Patience on Rate CutsBond Investors Are Lining Up to Fund the War Against PutinThe US had been hoping for a breakthr