World News Update, what you need to know

Indonesia is yet to name a date and place for the executions of Australians Andrew Chan and Myuran Sukumaran who are now officially in line for the firing squad.

ELSEWHERE:

SANAA - Yemeni President Abdrabuh Mansur Hadi has resigned after Shi'ite militia failed to honour an agreement to withdraw from the presidential palace, adviser Sultan al-Atwani says.

LONDON - Top officials from 21 countries, including Australia, have kicked off talks in London on pushing back Islamic State militants in Iraq and Syria and tackling the growing threat of homegrown jihadists in Europe.

DAVOS - The Duke of York has spoken out to "reiterate and reaffirm" Buckingham Palace statements rebutting allegations he had sex with an under-age teenager.

WASHINGTON DC - US President Barack Obama will not meet Benjamin Netanyahu when the Israeli prime minister makes a controversial visit to the United States in early March, the White House says.

BUENOS AIRES - Argentine President Cristina Kirchner says a prosecutor who apparently committed suicide was actually killed in an "operation" to implicate her government in a cover-up of a 1994 bombing of a Jewish community centre.

DONETSK - Pro-Russian separatists have paraded around 20 captive Ukrainian soldiers through the rebel stronghold city of Donetsk in a humiliating display hours after 13 people died in a trolleybus shelling.