Former Philippine President Rodrigo Duterte was almost certain to be elected mayor of his home city by a landslide on Monday, unimpeded by his detention at the International Criminal Court on charges of murder as a crime against humanity.

The midterm polls have revitalised the Duterte family’s political fortunes and put his daughter Sara, who is currently vice-president, in the running for a presidential election in 2028 that could have far-reaching consequences for regional security and disputes in the South China Sea.

The Philippines’s parliamentary elections reflect yet another vote between dynastic political families, but the outcome still has implications for Manila’s foreign policy towards Washington and