0720 GMT - The U.S. sold $25 billion in 30-year Treasurys on Thursday at 5.216%, the highest paid for yields of this maturity since 2001, reflecting concerns over U.S. debt and high inflation. The auction reflected worries over the "growing federal debt burden and inflation that remains above the Fed's target," Danske Bank analysts say in a note. Higher borrowing costs add pressure to public finances as debt servicing already exceeds defense spending, they note. Earlier this week, 10-year Treasurys were sold at their highest yield since 2007. Thirty-year Treasury yields last trade at 5.230%, up 1.9 bps on the day, Tradeweb data show.