The international community should also be alert to make sure that Myanmar does not evade any responsibility, she said at a press conference at Hotel Le Méridien in Dhaka on Thursday.
She was briefing media on the completion of her final mission carried out between January 15 to 23 this year in Thailand and Bangladesh.
She said that an international ad-hoc tribunal should be constituted for ensuring accountability of people found involved in the genocide and human rights violation in the Rakhine state of Myanmar.
The UN special rapporteur also expressed disappointment at China and Russia for opposing concrete action against Myanmar, a nation accused of genocide against the Rohingyas.
Lee said China cannot achieve its dream of being a global leader without respecting human rights and global justice.
