The deportations, which included former navy officers seeking asylum, expose those sent away to danger and are a violation of the international law on non-refoulement, according to UNHCR, referring to a law that protects refugees or asylum seekers from being deported.
"In the last two months alone, hundreds of Myanmar nationals are reported to have been sent back against their will by the authorities," UNHCR spokesperson Shabia Mantoo told a Geneva press briefing.
The latest incident involving an asylum seeker being sent back to conflict-torn Myanmar occurred on Oct. 21, Mantoo added, despite intervention by the UNHCR with authorities.
Myanmar's embassy in Malaysia previously said in a post on Facebook that 150 Myanmar nationals were deported by plane on Oct. 6 in cooperation with Malaysian immigration authorities.
So far, more than 150,000 refugees and asylum seekers, including many ethnic Rohingya Muslims, have fled to neighbouring Malaysia.