The Russian dollar-traded index RTS was down 1.49 percent, and ruble-traded MICEX fell 1.29 percent by midday.
Outside the political arena, declines in a pair of technology stocks added to the cautious tone on the day.
Bond prices, which move inversely to yields, closed higher.
The MSCI Asia Pacific Index excluding Japan lost 1.6 percent to 155.61 as of 4:57 p.m.in Hong Kong, set for its longest losing streak since July 4, as five stocks declined for each one that advanced.
"From a geopolitical perspective, we understand why the escalation in tensions will have shaken some of the complacency out of investors", said Eric Wiegand, senior portfolio manager at U.S. Bank Private Client Wealth Management. South Korea's KOSPI fell 1.8 percent to almost a three-month low. Nine of the index's 10 main groups ended lower.
Sanchez to miss start of season
Arsenal , without Sanchez, will host Leicester City at the Emirates Stadium on Friday night, to kick off the new season. "I can't tell you that at the moment", he said.
Solar eclipse science: What you need to know for Aug. 21
The telescopes will be manned by trained volunteers and scientists and the data uploaded will greatly benefit researchers. However, a majority of the sun will be covered no matter where you live across the state on Monday, Aug. 21.
Several financial sector companies also helped pull down the market. MetLife fell 75 cents, or 1.6 percent, to $47.56, while Charles Schwab slid 69 cents, or 1.6 percent, to $41.33.
J.C. Penney slumped as much as 18.25 percent to a record low after the retailer reported a bigger-than-expected quarterly loss. Kohl's like Macy's did beat estimates for earnings and revenues while Dillards delivered a loss of 58 cents per share as a result of deep discounting to shed inventory. Kohl's also declined, sliding $3.62, or 8.6 percent, to $38.31. Economists had expected prices to rise by 0.2 percent.
In the latest economic data, the consumer-price index (http://www.marketwatch.com/story/us-consumer-inflation-remains-soft-in-july-cpi-shows-2017-08-11) rose a seasonally adjusted 0.1% in July, its fifth straight month of softness, raising more questions about whether inflation will eventually rise to hit the Federal Reserve's 2% annual rate target.
OIL: Benchmark U.S. crude gained 13 cents to $49.69 a barrel on the New York Mercantile Exchange. Brent crude, used to price worldwide oils, added 21 cents to $52.91.
The local currency closed at 1,143.50 won against the US dollar, down 1.50 won from the previous session's close. The index is bouncing off its lowest closing level in six months. The euro fell to $1.1735 from $1.1752. While the German DAX Index has edged down by 0.1 percent, the French CAC 40 Index and the U.K.'s FTSE 100 Index are both down by 1 percent. Its rouble-based peer MICEX shed 1.2 percent to 1,937 points, its lowest since August 1. In Australia, the S&P/ASX 200 was down 1.13%.
Game Of Thrones stars discuss big reunion
Daenerys Targaryen might have laid waste to the Lannister forces last week, but with fire and blood comes lots of doom and gloom. Jon , Daenerys , Cersei, Varys are all brooding, talking, looking utterly bored in upcoming episode, Eastwatch .
Chinese leader asks Trump for 'restraint' on North Korea
He also retweeted a US Pacific Command message that said US planes stand ready to "fulfill a #FightTonight mission". Washington has been repeatedly stating that no option including the use of military force could be ruled out.
Gold for Pearson at world athletics championships
Australia's Sally Pearson bounced back from two years of injury hell to reclaim the 100 metres hurdles world title in London . American veteran Dawn Harper Nelson was second, .04 seconds behind, and Pamela Dutiewicz of Germany took bronze in 12.72.
Arsenal to make big Alexis Sanchez push
Danny Welbeck levelled matters in first-half stoppage time, completing a fast-paced, pulsating first half of action. Asked whether Mahrez would be at the club when the window closes, Shakespeare said: "Who knows?"
North Korea Has Markets Nervous But Not Panicked
Geopolitical concerns continued to weigh on Wall Street amid an ongoing escalation in tensions between the USA and North Korea. In commodities, US crude fell 0.67 percent to $49.23 per barrel and Brent was last at $52.58, down 0.23 percent on the day.
Are the Beckhams making a cameo on Modern Family?
The role of Phil is being played by [ David Beckham ]. "The role of Victoria Beckham is being played by @jessetyler", he joked. What happens when you combine the Beckham family and Modern Family? "Lovely to see you pictured all together".
Uber investor sues former CEO Kalanick for fraud
But while he is no longer chief executive, he remains on Uber's board and has the power to appoint three members. As per a court document, Benchmark holds about 20% of the voting rights in Uber and 13% of its ordinary shares.
Trent Murphy Reportedly out for Season with Torn ACL
The Redskins have stalwart Ryan Kerrigan as a starter but are presently without a healthy Preston Smith or Junior Galette . The Washington Redskins selected Murphy in the second round of the 2014 NFL Draft after a stellar career at Stanford.