An article in the Nikkei overnight on Bank of Japan efforts to control JGB yields

It discusses the sharp moves in the 10-year Japanese government bond yield in early February (3rd), when the BOJ did not step in to buy as yields rose ... and then the Bank scrambled into the market, appearing to have lost control of what they were trying to control.

it highlights market doubt on what it is the BOJ is trying to do, worth a read even though the piece does not break new ground

Yield curve proves hard to steer for nervous BOJ
Bond market struggles to discern central bank's signals