Russia formally withdrew its signature to the ICC's founding Rome Statute on Wednesday, calling the tribunal's work "one-sided and inefficient".
US troops train in Philippines despite Duterte threat
Speaking in his home town of Davao city in the southern Philippines shortly before flying to Peru for a regional summit, Duterte said: "They (Russians) may have thought the International Criminal Court is (useless), so they withdrew their membership."
"I might follow. Why? Because these shameless bullies only picked on small countries like us."
The Philippines is among 124 countries that are members of the UN-backed ICC, the world's only permanent war crimes court.
Duterte also repeated an earlier threat to pull the Philippines out of the UN, saying the world body had failed to stop wars that had killed "thousands" of women and children.
"You know if China and Russia would decide to create a new order, I will be the first to join," he added.
Wave of defections: Russia rejects ICC’s founding statute
Duterte won May elections in a landslide after vowing an unprecedented crackdown on illegal drugs and killing tens of thousands of drug dealers.
More than 4,000 people have been killed since he took office on June 30. About 1,800 were shot dead by police and about 2,600 others were murdered by unidentified attackers, according to official statistics.
The killings have drawn criticism from Manila's key defence ally the United States as well as the UN.
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