President Donald Trump. Thomson Reuters President Donald Trump tweeted reassurance Thursday morning that everything would "work out fine" with the US and Russia after he said the day before that relations between the two countries were at an all-time low.

"Things will work out fine between the U.S.A. and Russia," Trump tweeted. "At the right time everyone will come to their senses & there will be lasting peace!"

During a press conference Wednesday with NATO's secretary-general, Trump said the US "may be at an all-time low" in its relations with Russia. Russian President Vladimir Putin said the same day that trust between the US and Russia had deteriorated under Trump.

Tensions are heightened after a chemical-weapons attack in Syria last week that killed more than 80 people, including women and children. The US has blamed the regime of Syrian President Bashar Assad, a close ally of Russia, for the attack. Assad maintains that his government is not responsible, and Putin suggested earlier this week that the attack was a "false flag" designed to frame Assad.

In response to the attack, Trump last week ordered a strike on military infrastructure used by Assad's forces.