U.S. Secretary of State Antony Blinken attends a press conference with Kuwaiti Foreign Minister Sheikh Ahmad Nasser Al-Mohammad Al-Sabah (not seen in the picture) in Kuwait City, Kuwait, July 29, 2021. Washington is fully prepared to continue negotiation with Iran to return to the Iranian nuclear agreement, visiting U.S. Secretary of State Antony Blinken said here on Thursday. (Xinhua)