ISTANBUL Here’s a rundown of all the news you need to start your Sunday, including a rising death toll in Texas in flash floods that killed at least 51 people; President Volodymyr Zelenskyy announcing that Ukraine and the US reached an agreement to "significantly" enhance efforts on drones; and Iranian Supreme Leader Ayatollah Ali Khamenei appearing publicly for the first time since the end of a war with Israel to participate in Ashura ceremonies in Tehran. TOP STORIES Death toll in Texas flash