According to the DIU, people from African countries are lured to Russia through fake job advertisements circulated via Facebook and WhatsApp.
Kyiv has faced weeks of severe energy supply problems due to persistent Russian airstrikes.
UNICEF has expressed deep concern for the impact of the latest attacks on Ukrainian children.
She noted that more and more youngsters are directly caught in the conflict.
Mayor Ihor Terekhov wrote on Telegram on Monday that Russia has once again launched heavy air attacks on Ukraine, with 19 people injured in the large city of Kharkiv in the east of the country
President Joe Biden has authorised Ukraine to use U.S.-supplied long-range missiles against Russia.
Five tower blocks and an educational establishment were destroyed, the police said.
A Ukrainian drone attack sparked a fire at a factory in the western Russian region of Kursk, the region’s governor reported on his Telegram channel.
Mr Zelensky is expected to meet with Prime Minister Donald Tusk around midday.
The statement noted that fighting continues.
