* Rouble and markets lashed by U.S. sanctions
* Officials urge calm, speak of short-term volatility
* Pledge action to minimise sanctions impact
* The financial shock is a potential problem for Putin
MOSCOW, April 10 (Reuters) - The Russian government pledged to minimise the fallout from U.S. sanctions on Tuesday and dismissed sharp falls in the rouble and financial markets as short-term volatility, saying Russia needed time to adjust to the new curbs.
The rouble fell sharply for a second day, shedding over 3 percent of its value against the dollar, as investors continued a sell-off of assets fuelled by fears that the United States could impose more sanctions and a realisation that Russian credit and market risks had substantially increased.
The sanctions, announced on Friday, target officials and businesspeople around President Vladimir Putin in an aggressive response to alleged Russian meddling in the 2016 U.S. election.
The Russian market is under additional pressure from a proposal by two U.S. congressmen to impose further sanctions on Russia over the poisoning of ex-spy Sergei Skripal and his daughter in Britain - allegations Moscow denies.
The financial shock poses a potential political problem for President Vladimir Putin, who was re-elected last month and has promised to raise living standards and invest big in infrastructure and education and health.
The fragile economic recovery is now at risk and the government may be forced to spend money earmarked for fulfilling his pledges to bail out sanctioned Russian firms. Sharp falls in the rouble's value are also likely to make imports costlier, rattle the elite, and hit travel-minded Russians.
Putin's spokesman, Dmitry Peskov, said he thought the slump in asset values would be short-lived.
"There have indeed been strong negative trends on the market," Peskov told a conference call with reporters. "Partly that is to do with market trends, partly it's to do with the emotional fallout (from the sanctions). There will subsequently be a correction."
For Russian politicians and businessmen, the financial shock evoked painful memories of 2014 when Western sanctions imposed over Moscow's annexation of Ukraine's Crimea triggered precipitous falls, albeit much steeper, in Russian asset values.
Kirill Dmitriev, head of the state-run Russian Direct Investment Fund, told reporters at an annual Moscow Exchange forum to keep things in perspective.
"We think it is an absolutely short-lived market reaction, which in large part is driven by speculators, said Dmitriev.
After losing $250 million on Monday, Oleg Tinkov, founder and chairman of Tinkoff Bank, said he was unfazed.
There were worse days," Tinkoff told the same event. "I remember losing $1 billion in one day so it was actually a very positive day yesterday ... Being on the Russian stock market resembles living on a volcano."
'NO RISKS TO FINANCIAL STABILITY'
Finance Minister Anton Siluanov said authorities would do everything they could to minimise the impact of the U.S. sanctions for business and financial markets.
Elvira Nabiullina, the governor of the central bank, said the bank had a wide range of tools to act if any risks to financial stability emerged. But she said she did not see such risks at the moment.
Nabiullina said she and her colleagues were closely watching the market correcting after Friday's U.S. sanctions, but expected things to settle down in time.
"As happens with such situations, in the first days afterwards there is heightened volatility because there's a lot of uncertainty and the consequences are not completely understandable for investors and market participants," Nabiullina told the Moscow Exchange event.
" ... But in our view some time is needed for the economy's financial sphere to adapt to the changed external conditions and I'm sure that the economy and the financial sphere will adapt."
The Russian finance ministry canelled a regular weekly auction of OFZ treasury bonds on Wednesday for the first time since 2015, citing "unfavourable market conditions." Yields for the rouble-denominated bonds, popular among foreign investors, have sky-rocketed on news of the new U.S. sanctions.
Economy Minister Maxim Oreshkin said the floating rouble rate was helping to offset a possible negative effect on the Russian economy. The economy is projected to grow by 2 percent this year after a 1.5 percent increase in 2017.
Putin was due to discuss the state of the economy with Prime Minister Dmitry Medvedev later on Tuesday in what the Kremlin billed as a routine meeting.
Medvedev, who has spoken of possible retaliatory steps against the United States, has ordered his government to prepare measures to support sanctioned Russian entities with aluminium producer Rusal, which has seen its shares more than halve, expected to be among those helped.
Rusal's own problems deepened on Tuesday after Swiss-based trader Glencore suspended a plan to swap its shares in Rusal for Global Depository Receipts in EN+, tycoon Oleg Deripaska's holding company.
Glencore also said that Ivan Glasenberg, its chief executive, had resigned from his position as a director of Rusal.
(Reporting by Katya Golubkova, Maria Tsvetkova, Andrey Ostroukh, Jack Stubbs, Elena Fabrichnaya, Polina Nikolskaya, Polina Ivanova, Vladimir Abramov, Christian Lowe, Tatiana Voronova, Daria Korsunskaya Writing by Andrew Osborn Editing by Richard Balmforth)