World News Update, what you need to know

Malaysia Airlines has urged relatives of those aboard ill-fated flight MH370 to file their claims by March 8, the end of the two-year period for next of kin to preserve their legal rights to compensation.

ELSEWHERE:

WASHINGTON - Donald Trump's campaign for the Republican presidential nomination is building a momentum that may sweep away challenges by Marco Rubio and Ted Cruz, with his crushing win in the Nevada caucuses marking a third straight victory in state contests.

BARCELONA - Without reductions in planet-warming emissions, blistering heat waves of the strength that now typically occur once every 20 years could happen annually on 60 per cent of the Earth's land areas by 2075, scientists are warning.

LONDON - Former Sunderland footballer Adam Johnson has told an English court his team-mates have distanced themselves from him since he admitted kissing and grooming an under-age schoolgirl.

BEIJING - Move over, New York City: Beijing is the new "Billionaire Capital of the World".

IDOMENI - Migrants cradling young children have blocked a motorway in central Greece demanding onward passage to Macedonia, part of a growing bottleneck of refugees stranded by new border restrictions and closures across Europe.

BERLIN - A Moroccan man who is the first person to be convicted for New Year's Eve crimes in the German city of Cologne has been given a six-month suspended sentence for stealing a mobile phone and possessing drugs.

NEW YORK - Facebook says "Reactions", an extension of the "Like" button, has now been rolled out worldwide.