The 15 members of the UN Security Council are expected to begin closed-door talks on North Korea in the coming minutes.
The scheduled meeting in New York is to discuss a draft resolution that would sanction the country for its third nuclear test last month.
UN diplomats have told Reuters new agency they expect to vote on the draft resolution by the end of this week, although it could face opposition from China.
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Duncan Jones tweeted: "1 month since dad died today. Made this card for him at Christmas. Due in June. Circle of life. Love you, granddad."
More than 10 days after his body was found, Richard Cole's family claim they are still in the dark over the circumstances of his death.
A cold and frosty start, then staying largely dry with plenty of sunshine.