Foreign ministers from the Group of Seven (G7) major industrialised nations meeting in Lucca in Italy are looking to put pressure on Russia to break its ties with Syrian President Bashar al-Assad, Al Jazeera report. Calling last week's US missile strike on a Syrian airbase a "game changer", Boris Johnson, UK foreign minister, said on Monday that support for Assad "was toxifying the reputation of Russia" and suggested that sanctions could be imposed on Russia if it refused to change course. Italy has invited the foreign ministers from Turkey, Saudi Arabia, United Arab Emirates, Jordan and Qatar to sit down with the G7 group in Lucca on Tuesday to discuss Syria. All oppose Assad's rule. Rex Tillerson, US secretary of state, is due to travel to Moscow on Tuesday at the end of the two-day gathering in the Tuscan city with his Italian, German, French, British, Japanese and Canadian counterparts. "What we're trying to do is to give Rex Tillerson the clearest possible mandate from us as the West, the UK, all our allies here, to say to the Russians 'This is your choice: stick with that guy, stick with that tyrant, or work with us to find a better solution'," Johnson said after meeting Tillerson. Chemical attack Johnson said he was keen to seen further sanctions imposed on both Syrian and Russian "military figures". However, Tillerson has said the main priority for the US is the defeat of the Islamic State of Iraq and the Levant (ISIL) group, and it is unclear how far he will want to push the Russians. The diplomatic developments come after a suspected chemical attack on a rebel-held Syrian town that the Syrian Observatory for Human Rights, the UK-based monitoring network, said killed 87 people. It prompted the US to intervene for the first time directly against the Assad government which it has blamed for the attack.