At least seven people are known to have died in bombing by Russian forces, Ukrainian police say.
Officials say an attack on a military unit in Podilsk, outside Odessa killed six people and wounded seven.
Nineteen people are also missing.
One person died in the city of Mariupol, they added.
Earlier today, Russian forces fired missiles at several Ukrainian cities and landed troops on its south coast, officials and media said, after President Vladimir Putin authorised what he called a special military operation in the east.