FRANKFURT (Reuters) -Commerzbank’s first-quarter profit more than doubled even as it increased provisions and writedowns as a result of the Russia-Ukraine conflict, it said on Tuesday. The German lender stood by its profit outlook for the full year as it made an unexpected preliminary earnings announcement of first-quarter net profit at 284 million euros ($303 million), up from 133 million euros a year earlier. It said that operating profit of 544 million euros “significantly exceeds” analysts expectations. The bank said revenue improved in all business areas, but it increased its provisions a…