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FOREX-Dollar hits four-week low as yields pull back; rouble sinks

* Russian rouble drops more than 1% on reports of U.S. sanctions

* Euro hits four-week high to dollar with U.S. yields subdued

* Commodity-linked Aussie and Kiwi reach three-week peaks

* Graphic: World FX rates tmsnrt.rs/2RBWI5E

LONDON, April 15 (Reuters) - The U.S. dollar sank to a four-week low against other major currencies on Thursday as Treasury yields pulled back from last month’s surge, with investors increasingly convinced the Federal Reserve will keep interest rates low for some time.

The Russian rouble sank more than 1% to 76.65 per dollar on reports the United States will announce sanctions on Russia as soon as Thursday for alleged election interference and malicious cyber activity.

The dollar index, which tracks the it against six other currencies, dipped to its lowest since March 18 at 91.535 in the European session before recovering to be basically flat at 91.590.

The euro rose as high as a four-week top of $1.1990, matching the highest level since March 4, before trading little changed at $1.19735.

The dollar changed hands at 108.87 yen, after hitting a three-week low of 108.755 on Wednesday.

Ten-year U.S. bond yields eased to 1.6165% in European trade, down from a 14-month peak of 1.776% reached in late March, reducing the dollar’s yield attraction.

“The UST yields, while elevated historically, have been caught in a tight range in recent weeks and thus offered little support to the USD,” said Valentin Marinov, head of G10 FX research at Credit Agricole.

“This is due to the still very dovish tone of the Fed that seemed to ignore the rapidly improving outlook for the US economy.”

Repeated assurances from Fed officials that they will keep interest rates low have helped stabilise U.S. bonds, especially at the short end of the market.

Meanwhile, stocks have marched higher, with the S&P 500 setting records this week.

Fed Chair Jerome Powell said on Wednesday that in time the U.S. central bank would reduce its monthly bond purchases before it committed to an interest rate increase, a scenario many investors had regarded as a given.

A weaker U.S. dollar also saw commodity currencies supported. The Australian dollar rose as high as $0.7754 on Thursday for the first time since March 23, following a 1% rally the day before that saw it break out of its tight trading band over the past few weeks.

The New Zealand dollar also rose to a three-week high of $0.7174.

“In the near-term, the U.S. dollar investors will likely focus on the U.S. data today and tomorrow, which should confirm that the economic outlook continues to improve,” Marinov said.

“To the extent that the UST yields remain caught in recent ranges, the overbought and overvalued USD could struggle to recover. At the same time, supportive global risk sentiment could be a boon for high-yielding commodity currencies like the AUD and the NZD.”

Thursday is busy with U.S. data, including retail sales readings for March and weekly jobless figures due at 1230 GMT.

Bitcoin stood near the record high of $64,895.22 reached on Wednesday, when cryptocurrency platform Coinbase made its debut in Nasdaq in a direct listing. The world’s most popular digital token last changed hands around $63,250.

After volatile trading, the stock closed at $328.28, which gave the firm a market capitalisation of $65.39 billion, about the same as New York Stock Exchange owner Intercontinental Exchange Inc.

Reporting by Ritvik Carvalho; additional reporting by Kevin Buckland and Hideyuki Sano in Tokyo; Editing by Larry King and Alison Williams

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