Is the resumption of oil transportation via 'Druzhba' legal?

I read that Ukraine resumed the transportation of Russian oil through the 'Druzhba' pipeline after repairs. I am interested in whether this complies with Ukrainian legislation and whether there are any restrictions or risks due to sanctions or other regulations related to the war? How can one find out if such operations are currently permitted, and what could be the consequences for the state or companies in case of violating legal requirements?