US President Donald Trump has told Russia and Syria to “get ready” for a missile attack on the Assad regime, saying the bombs will be “nice and new and smart”, Telegraph said.

The tweet came after the Russian ambassador to Lebanon said in an interview on Tuesday with Hezbollah-owned al-Manar TV that “if there is a US missile attack, we – in line with both Putin and Russia’s chief of staff’s remarks – will shoot down US rockets and even the sources that launched the missiles”.

Trump further chided Russia for its support of Syrian President Bashar al-Assad in Wednesday’s tweet, saying it “shouldn’t be partners with a Gas Killing Animal who kills his people and enjoys it!”

Russia vows to shoot down any and all missiles fired at Syria. Get ready Russia, because they will be coming, nice and new and “smart!” You shouldn’t be partners with a Gas Killing Animal who kills his people and enjoys it!

— Donald J. Trump (@realDonaldTrump) 11 April 2018

The warnings come as the US and several European countries threatened to use military action against the Syrian government and its main ally, Russia, in response to a suspected chemical weapons attack on the rebel-held town of Douma.

Saturday’s attack in Eastern Ghouta has killed dozens of people, mostly women and children, according to activists and local medics.