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* Pound traders lock in profits before British election result
* Trump to meet advisers on China tariffs
* Dovish Fed message sees dollar touch lowest since August
* Treasury yields up in Asia, Europe
* No change from ECB at Christine Lagarde's first meeting
* Turkey and Ukraine both slash interest rates by 200 bps
* Wall Street expected to open flat to slightly lower
By Marc Jones
LONDON, Dec 12 (Reuters) - World shares took another run at record highs on Thursday, as the right messages from the U.S. Federal Reserve set traders up for a packed day of central bank meetings and a Brexit-defining election in Britain.
The Fed kept U.S. interest rates unchanged, as expected, but it was a message that it would take an unexpected and "persistent" rise in inflation to lift them again that cheered the bulls and pushed the dollar to its lowest since August.
Asian shares rallied almost 1% overnight, despite reports Washington will press on with new China tariffs. European trading left MSCI's broadest world share index just 0.1% shy of its 2018 record high.
"This is quite a strong signal that current interest rates will remain at these low levels for the time being," Mirabaud's chief economist, Gero Jung, said of the Fed, the European Central Bank and Switzerland's SNB which had also kept rates steady.
"And we have a modest cyclical improvement in the economy, so that is good for risk assets."
It was the start of a series of events over the next few days likely to set the course of financial markets for months to come.
Sterling weakened from its highest in more than two years versus the euro and an eight-month high versus the dollar with voting underway in an election that will determine whether Britain exits the European Union next month.
Expectations are that the ruling Conservatives, led by Boris Johnson, will gain a majority that allows his stalled Brexit deal to be passed by a new parliament, but the latest polls have shown the lead shrinking.
Exit polls for Britain's election will begin around 2200 GMT, after voting closes. Whether there will be a clear winner or another hung parliament is likely to emerge between 0400 GMT and 0600 GMT.
Following a 10% surge by the pound in the last few months, traders are now hedging their bets. Peter Kinsella, Union Bancaire Privée's global head of forex strategy, said a Conservative majority remained his expectation, however.
"We think a move to levels of around $1.35 or even $1.37 is entirely feasible," if there is a Conservative majority. With another hung parliament "you are definitely back down to $1.26-1.27."
The pound was last down 0.2% at $1.3170 just off its March highs and near a May 2017 peak against the euro at 84.49 pence.
THE NEW LAGARDE
The euro held at $1.1135 as Christine Lagarde kept the ECB's sub-zero interest rates steady at her first meeting as president of the European Central Bank.
Her first post-meeting press conference was being closely watched, especially with the bank also updating its economic forecasts and due to make changes to its policy framework next year.
"The scope of the strategy review may not be finalised before early 2020, but it should be centred on four main issues: the definition of price stability and the inflation measures; the side effects of unconventional policy measures; the internal and external communication strategy; climate risks," said Frederik Ducrozet at Pictet Wealth Management.
Switzerland's central bank also kept its policy ultra-loose and reaffirmed that negative interest rates would remain central to its plans. The Swiss franc was little changed.
Turkey slashed its main rate 200 basis points to 12%. Ukraine also cut its key rate 200 bps, to 13.5%.
Meanwhile, U.S. President Donald Trump is expected to meet top advisers on Thursday to discuss tariffs on nearly $160 billion of Chinese consumer goods that are scheduled to take effect on Dec. 15, three sources told Reuters.
Trump is expected to go ahead with the tariffs, a separate source told Reuters, which could scuttle efforts to end a 17-month trade war between the world's two largest economies.
The dollar index against a basket of six major currencies fell to a four-month low of 97.057, but spent most of the European session regaining ground.
Treasury yields had also fallen in reaction to the Fed's comments, but they recovered, too. Yields on the benchmark 10-year Treasury reached 1.7966 before what was expected to be subdued Wall Street opening.
In commodities, U.S. crude edged up 0.4% to $59 a barrel and global benchmark Brent rose 0.5% to $64 per barrel. A report by OPEC released on Wednesday suggested that oil markets are tighter than previously thought.
Traders also watched as shares of newly floated Saudi state oil company Saudi Aramco rose 4.5% and its valuation touched $2 trillion, its debut on the Riyadh stock market on Wednesday.
(Reporting by Marc Jones; Editing by Alex Richardson)