Citigroup Inc.’s commercial banking unit will hire 900 staff over the next three years, a large part of which will be for the U.S. bank’s Asia Pacific business, as it plans to fast-track growth. The U.S. lender said on Monday that along with launching in new markets and expanding its digital capabilities, the Citi Commercial Bank (CCB) unit is looking to ramp up its presence in high-growth and emerging markets. The bank, which currently operates in 60 countries and focuses on lending to mid-sized companies, said a bulk of the hires are expected to be in areas where it sees an increase in business activity, particularly the United States, China, Brazil, India, and countries in Western Europe. The move comes at a time when the Wall Street institution has been cutting down its international footprint by exiting non-core markets. Chief Executive Jane Fraser, who took the helm last year, has …