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Bonds turn negative; Traders eye Ukraine, Scotland

Symbol
Yield
 
Change
%Change
US 3-MO
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US 1-YR
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US 2-YR
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US 5-YR
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US 10-YR
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US 30-YR
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U.S. Treasurys fell on Monday as safe haven-bids waned, having earlier been boosted by amid fresh upheaval in the Ukraine crisis and news that voters were leaning in favor of an independent Scotland.

Benchmark 10-year notes fell 4/32 in price bringing the yield up to 2.47 percent. U.S. 30-year Treasury bonds lost 4/32 in price, trading to yield 3.23 percent.

Read MoreCNBC explains: Treasury bond prices and yields

The latest poll reviewing the chances Scotland will vote for independence, carried out by British newspaper the Sunday Times, suggests the 'Yes' vote will narrowly scrape through, after a rising tide of support over the summer.

Read MoreScotland: Do the Ayes have it?

Investors also awaited a European Union decision on a possible next wave of sanctions against Moscow after cease-fire agreement in Ukraine looks increasingly shaky. If imposed, Russian Prime Minister Dmitry Medvedev has said Moscow will respond "asymmetrically" to new sanctions over the Ukraine crisis, possibly targeting flights over Russia.