Trump tells Russia to get ready for US missiles fired at Syria which Russia has vowed to shoot down

The US and Russia came significantly closer to a direct clash over Syria on Wednesday when Donald Trump fired off an incendiary tweet that told Moscow to “get ready” for incoming US missiles, which the Russian military has vowed to shoot down.

A standoff over a poison gas attack on a rebel-held suburbium of Damascus on Saturday has since spiraled into the most dangerous showdown between the two nuclear-armed powers since the height of the cold war, driven by Vladimir Putin's uncompromising backing for the Assad regime in Damascus and the volatility of the US president.

” Russia vows to shoot down any and all rockets fired at Syria ,” the US president tweeted.” 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 !”

The Kremlin spokesman, Dmitry Peskov, called for calm.

” We do not be actively involved in Twitter diplomacy ,” Peskov was quoted as saying by Interfax.” We support serious approaches. We continue to believe that it is important not to take steps that could harm an already fragile situation .”

Despite the president's menacing tweet, both the White House spokeswoman, Sarah Sanders, and the defence secretary, James Mattis, indicated a decision on military action was still pending.

” All alternatives are on the table and a final decision hasn't been constructed ,” Sanders said.

Mattis said the US was ” still assessing intelligence” on Saturday's attack on Douma, before attending a White House meeting of military and intelligence chiefs chaired by Vice-President Mike Pence.

In anticipation of an attack, Syrian aircrafts had been flown to three Russian airbases and senior Syrian government officials had been moved to safe house in Damascus, according to sources in Turkey.

A US naval battlegroup- including the guided missile destroyer USS Donald Cook, and mostly likely a cruise missile submarine, USS Georgia- is now in place in the eastern Mediterranean on Wednesday night.

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White House fights to explain Trump's Russia missile tweet- video