U.S. Treasury yields fell Friday, as investors continued to monitor developments on the Russia-Ukraine crisis.

The yield on the benchmark 10-year Treasury note was down 5.6 basis points at 1.918% by 4:10 p.m. ET. The yield on the 30-year Treasury bond moved 7.8 basis points lower to 2.236%. Yields move inversely to prices and 1 basis point is equal to 0.01%.

The Wall Street Journal reported midday Friday that U.S. officials expect a Russia attack in a few days.

President Joe Biden is expected to move more U.S. troops closer to Ukraine, NBC News reported. The Ukrainian government and Russian state-controlled media on Friday exchanged fresh accusations of cease-fire violations at the border.

Secretary of State Antony Blinken speaking to the United Nations on Thursday warned that the situation is at a "moment of peril."

Meanwhile, the Federal Reserve's plans to tighten monetary policy has also been in focus for investors. St. Louis Fed President James Bullard warned on Thursday that without action on interest rates, inflation could become an even more serious problem.

New York Fed President John Williams on Friday said he didn't see "any compelling reason to take a big step at the beginning," but the central bank could decide later to speed up.

— CNBC's Jeff Cox contributed to this market report.