0048 GMT - Asian currencies are mixed against the dollar, but may be buoyed by the U.S. Treasury Department's announcement on Wednesday that it'll buy back more of its longer-term bonds. The dollar seems to be under pressure, strategists at OCBC Group Research say in a research report. The Treasury's announcement "helped cap long-end U.S. yields," they say. It "signals Treasury's discomfort with the rise in long-term yields and should help restrain further increases in long-end yields in the near term," they add. The U.S. dollar falls 0.3% to 4.0420 ringgit, but is little changed at 1.2713 Singapore dollar and is 0.2% higher at 1,390.70 won, LSEG data show.