Russia should end its support for "toxic" Syrian President Bashar al-Assad, British Foreign Secretary Boris Johnson said on Monday ahead of a meeting of G7 foreign ministers in Italy. "It's time for (Russian President) Vladimir Putin to face the truth about the tyrant he is propping up," Johnson said, according to a foreign ministry spokeswoman. "We need to make it clear to Putin that the time to back Assad has gone," he said, warning that Putin was "damaging Russia" by supporting Assad.