MOSCOW (Reuters) - The first trucks in a Russian humanitarian convoy have reached the city of Luhansk in east Ukraine, Interfax news agency reported on Friday, citing pro-Russian rebels who control the city.

Ukrainian President Petro Poroshenko said earlier in the day that the entry of the Russian aid convoy into Ukraine represented a violation of international law and called on Moscow to return the situation to an internationally legal footing.

(Reporting By Alexei Anishchuk)