"The financial system is rather robust.That's obvious to everyone", said Kremlin spokesman Peskov.
Peskov highlighted on Thursday what he called the "unpredictability of Russia's partners across the Atlantic.you can expect anything from Washington", he told CBS News partner network BBC News, calling the us, "an unpredictable global player".
The new sanctions will take effect on or around August 22, and relate to exports of electronic components and other technologies.
Those products include machinery and electrical parts - the trade of which could be worth "potentially hundreds of millions of dollars", according to a senior USA state department official.
Washington's latest measures were imposed on Wednesday after it determined Moscow had used a nerve agent against a former Russian double agent, Sergei Skripal, and his daughter in the UK.
The US has imposed sanctions on Russian Federation after concluding that Moscow was behind the Salisbury nerve agent attack. Investigators believe she found the substance in a discarded bottle and thought it was perfume. One of them, Dawn Sturgess, died eight days later.
US State Department spokeswoman Heather Nauert said the action was aimed at punishing Russian President Vladimir Putin's government for having "used chemical or biological weapons in violation of global law".
Russian sovereign dollar bonds lost over two cents on Wednesday, with Russian equity ETFs dropping more than 4 percent in US hours.
In an early reaction, the Kremlin said the sanctions were illegal and unfriendly, and the USA move was at odds with the "constructive atmosphere" of Trump's and Putin's encounter in Helsinki.
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Even as rumors of impending new sanctions swirled in the media, Kentucky Senator Rand Paul - a supporter of Trump's efforts to engage Russia - announced he had delivered a letter from President Trump to Putin during meetings with Russian officials in Moscow earlier this week.
Those slated for August are likely to include an export ban on sensitive national security technology and goods.
A senior Russian lawmaker denounced the sanctions as "lynch law". Moscow, in turn, responded to the global action by ordering its own expulsion of foreign diplomats.
Analysts in Moscow said it was highly unlikely that Putin would allow inspectors to enter the country to head off the additional sanctions, since doing so would look like succumbing to USA pressure.
But investors didn't wait for details, driving the Russian ruble to a two-year low against the dollar and sending shares in Russian companies plummeting on the stock market.
The Kremlin said the new sanctions were "illegal and do not correspond to worldwide law".
PA Wire/PA Images Yulia Skripal, who was contaminated with the nerve agent Novichok along with her father Sergei Skripal.
Image copyright Getty Images Image caption 2014: Protestors clash with authorities in Ukraine after the area of Crimea was annexed by Russia What different types of sanctions are there?