The Russian ruble extended its earlier losses after President Donald Trump tweeted about President Barack Obama's stance on Russia with respect to Crimea.

The petrocurrency is down by 1.2% at $57.8170 per dollar as of 7:55 a.m. ET.

"Crimea was TAKEN by Russia during the Obama Administration. Was Obama too soft on Russia?" Trump tweeted around 7:42 a.m. ET.

The ruble was down by about 0.8% earlier in the morning amid weaker Brent crude oil prices, which are down by about 0.6% at $55.63.

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