Vladimir Putin’s spokesman Dmitry Peskov dismissed Donald Trump’s attempts to talk to Russia through a barrage of tweets on Wednesday, and warned that the US president risked worsening “an already fragile situation.”

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“We don’t do Twitter diplomacy. We are proponents of a serious approach,” Peskov told the media in Moscow. “We still think it is important to avoid steps that could harm what is already a fragile situation.”

In his earlier missives, Trump veered between intimidation and encouragement towards Moscow. He warned Russia to “get ready” for “nice, new and ‘smart’” missiles as a result of supporting Bashar Assad, who he described as “a Gas Killing Animal who kills his people and enjoys it.” This suggested that a US military response to the alleged use of chemical weapons in Syria on April 7 is imminent.

READ MORE: Trump: Get ready Russia, missiles will be coming at Syria, nice and new and ‘smart’!

However, Trump later wrote that there is “no reason” for the relationship between the Kremlin and the White House to be “worse now than it has ever been,” and asked “all nations to work together.” He also enjoyed a sideswipe at the “Fake & Corrupt Russia Investigation” for causing “much of the bad blood with Russia.”