Wikileaks founder Julian Assange is due to speak publicly for the first time since March over the widening diplomatic row surrounding him.
The 41-year-old, who was granted asylum by Ecuador on Thursday, has been holed up in their embassy in London for two months.
He is set to make a statement at 3pm CET with speculation he will speak from the balcony of the embassy.
Britain says it could invoke powers to shut the mission and will arrest Assange if he steps outside the building, which under diplomatic agreements is the property of Ecuador.
Ecuadorian President Rafael Correa has hit out at the threat while London has denied it would storm the building.
“We reject this unacceptable, intolerable threat to violate our diplomatic headquarters in London,” said Correa.
“We have convened a meeting with neighbouring countries this Sunday to present this intolerable situation, inadmissible in international law,” he added.
Britain says Assange, who is facing extradition to Sweden over rape allegations, should give himself up.