* LME/ShFE arb: http://bit.ly/2wZSAEz
* GRAPHIC-2018 asset returns: http://tmsnrt.rs/2jvdmXl (Updates throughout, adds comment, closing prices)
LONDON, May 18 (Reuters) - Aluminum fell to a two-week low on Friday after news that sanctions-hit Russian businessman Oleg Deripaska would not seek re-election to Rusal's board of directors, easing concerns that supply from the company would be disrupted.
Copper, meanwhile, headed for its first weekly loss in three as uncertainties over the outlook for global growth and this week's burst of dollar strength weighed on prices.
In a statement, Rusal's parent company EN+ said Deripaska had resigned from its board and undertaken not to stand again as a director of Rusal.
Aluminum hit a six-year high last month after the United States imposed sanctions on Rusal, the world's second-biggest producer of the metal. It has since retraced more than half of those gains on hopes that supply may be hurt less than feared.
"The key thing is that those risks that were priced in have to be crystalised for the price to remain where it got to," ETF Securities analyst Nitesh Shah said.
"As (expectations grow) that the sanctions won't be as constraining as the market had initially priced in, I think we are going to see a bit of a slide down."
* ALUMINIUM PRICES: Three-month aluminum on the London Metal Exchange closed at $2,270 a tonne, down 1 percent. Earlier it touched its weakest since May 2 at $2,245 a tonne.
* ALUMINIUM SPREADS: The spread between aluminum for immediate delivery and the three-month contract
Particular tightness in the curve was seen in the July to August spread, which was last trading in a $19 backwardation.
* COPPER: LME copper ended the day down 0.3 percent at $6,855 a tonne, a 0.9 percent fall week-on-week.
* FINANCIAL MARKETS: The dollar hit a five-month high against a basket of currencies, buoyed by a further rise in U.S. Treasury yields that suggests an upbeat outlook for the world's largest economy.
* NICKEL: LME nickel finished up 1.1 percent at $14,750 a tonne. "Discussions out of LME Week Asia have ... been positive, with the focus on the rising impact of the electric vehicle market boosting sentiment," ANZ said in a note.
* OTHER METALS: LME zinc ended up 0.1 percent at $3,099.50 a tonne, while lead closed 1.9 percent lower at $2,330 a tonne and tin finished up 0.6 percent at $20,780 a tonne.
(Additional reporting by Manolo Serapio Jr. in Manila; Editing by David Goodman and Mark Potter)