* Graphic: World FX rates in 2017 http://tmsnrt.rs/2egbfVh
By Nigel Stephenson
LONDON, May 10 (Reuters) - European shares pulled back on Wednesday from 21-month highs hit after strong earnings while the dollar fell on concerns that U.S. President Donald Trump's dismissal of his FBI chief could make passage of his tax reform plans more difficult.
Expectation-beating first-quarter company results have lifted stock markets across the globe, with European full-year earnings forecasts set to be their best since 2010. The prospect of U.S. tax cuts has also helped push shares higher.
At the same time, measures of market volatility are at rock-bottom. The U.S. VIX index .VIX fell on Tuesday to 9.56, its lowest since late 2006. [http://reut.rs/2pja9xd ]
However, Trump's abrupt sacking of FBI Director James Comey marked a fresh intrusion of politics into markets after Emmanuel Macron's weekend victory in the French presidential election had seemed to clear the decks of major political risk, at least in Europe.
"There is no doubt that Trump is dominating proceedings this morning after the sacking of Comey. This is a political story rather than a market story, but yet again it creates uncertainty in the market, which leaves everything the president does with a cloud floating over it," said James Hughes, chief markets analyst at GKFX in London.
The pan-European STOXX 600 index .STOXX fell 0.2 percent, led down by construction and materials stocks .SXOP , having hit its highest since August 2015 on Tuesday.
Asian shares, however, edged up for a third consecutive day. MSCI's main index of Asia-Pacific shares, excluding Japan .MIAPJ0000PUS rising 0.1 percent, having earlier matched a two-year high hit last week.
Twelve-month forward earnings-per-share for the index is at its highest level in more than three years.
South Korean stocks .KS11 led losers as investors took profits after liberal leader Moon Jae-in was elected president, while Chinese shares closed lower after factory gate prices ion the world's second-biggest economy cooled more than expected in April. shares .N225 hit a 17-month high, up 0.3 percent on the day as a relatively weak yen outweighed concerns triggered by Trump's sacking of Comey. U.S. president said he had fired Comey, who had been leading an investigation into the Trump 2016 campaign's possible collusion with Russia, over his handling of an email scandal involving then-Democratic candidate Hillary Clinton.
The dollar fell 0.1 percent against a basket of major currencies .DXY after slipping on the view that political uncertainty could derail Trump's tax reform plans, the prospect of which has helped lift riskier assets.
"The Comey news is being treated as a risk-off event, and the headlines were sparking the dollar's move down," said Bart Wakabayashi, branch manager for State Street Bank and Trust in Tokyo.
The yen JPY= , often sought in times of market uncertainty, was last 0.1 percent higher at 113.83 to the dollar. The euro EUR= was flat at $1.0870.
FALLING YIELDS
Falling U.S. Treasury yields also weighed on the dollar. Ten-year yields US10YT=RR were down 3.1 basis points at 2.38 percent after retreating from five-week highs touched on Tuesday as investors made room in their portfolios for new issuance of government and corporate debt.
The most eye-catching move in euro zone government bond markets was a fall in Greek 10-year government yields to their lowest since its debt was restructured in 2012.
Athens and its creditors reached a deal this month on reforms that could trigger the release of more rescue funds.
"There is a relief that Greece will get its disbursements to get through the summer, and that is the main driver of the bond rally," ING's senior rates strategist Martin van Vliet said.
Oil prices rose after Saudi Arabia said it would cut supplies to Asia and U.S. inventories fell more than expected. Brent crude LCOc1 was last up 51 cents at $49.24 a barrel.
Gold XAU= rose 0.1 percent to $1,222 an ounce.
For Reuters Live Markets blog on European and UK stock markets see reuters://realtime/verb=Open/url=http://emea1.apps.cp.extranet.thomsonreuters.biz/cms/?pageId=livemarkets
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