China warned the Iran-Israel conflict may spread wider instability in the Middle East, with Foreign Minister Wang Yi reaching out to both countries as their days-old conflict shows no end in sight.

China has issued advisories to its citizens in Israel and Iran of the "complex and severe" security situation in those countries on Friday, adding a warning to those in Israel to prepare for possible missile and drone attacks.

The Group of Seven summit has opened in Canada with world leaders scrambling to contain the escalating conflict between Israel and Iran over Tehran’s nuclear program.