Top U.S. and European diplomats are heading to the Middle East in a new push to avoid escalation after a tense week in which a suspected Israeli strike in Beirut killed a senior Hamas leader and a U.S. strike in Baghdad killed an Iran-linked militia commander. Secretary of State Antony Blinken on Friday arrived in Turkey, the first stop on his Middle East tour, and Josep Borrell, the European Union’s top diplomat, is visiting Lebanon until Sunday.