The United Nations said about 6.3 million people have fled Ukraine since February 2022.
Mr Niinisto arrived in Ukraine on Tuesday for his first visit since the beginning of the Russia-Ukraine conflict.
IMF says economic growth in the Asia and Pacific region is expected to slow down in 2022 and 2023.
Cabinet Secretary Khandker Anwarul said government offices and autonomous institutions would open from 8:00 a.m. to 3:00 p.m. instead of the usual eight hours.
Following the outbreak of the Russia-Ukraine conflict on February 24, 2022, the EU Council adopted several sanctions against Russia.
