WASHINGTON ? Secretary of State John Kerry is due in Cairo on Saturday to address strained U.S. ties with Egypt at the start of an eight-day, around-the-world trip focusing on security and economic issues in the Mideast and Southeast Asia. After talks with Egyptian officials, Kerry plans to meet in Doha, Qatar, with foreign ministers from Saudi Arabia and other Persian Gulf Arab nations seeking new security assurances after the nuclear deal with rival Iran. While in Doha, he's scheduled to meet with Russian Foreign Minister Sergei Lavrov to review implementation of the Iran accord and discuss the prospect of involving Iran in...