TOKYO—The Bank of Japan (BOJ) maintained its massive stimulus on Friday and warned of heightening risks to a fragile economic recovery from the Ukraine crisis, reinforcing expectations it will remain an outlier in the global shift towards tighter monetary policy. Rising fuel and commodity prices blamed on the war in Ukraine could drive up consumer inflation to the BOJ’s 2 percent target in coming months, Governor Haruhiko Kuroda said. But such cost-push inflation will be short-lived and won’t prompt the BOJ to withdraw stimulus, he added, stressing the bank’s resolve to maintain huge monetary support for an economy yet to fully recover from the COVID-19 pandemic’s wounds. “There’s a chance Japan will see inflation move around 2 percent from April onward. But most of that is due to rising commodity prices, so there’s no reason to tighten monetary policy. Doing so would be inappropriate,” he told a news conference. The …