On June 26 it was reported that London's controversial mayor had withdrawn the city from the project, which aims for the global abolition of nuclear weapons by international agreement.
It promotes the solidarity of towns and cities in working toge
ther to press for a nuclear weapon-free world.
Eastbourne and Seaford are two of 2,410 member cities of Mayors for Peace in 131 countries.
Eastbourne mayor Greg Szanto and Seaford mayor Carolyn Lambert joined the widespread tide of objection to London's withdrawal by writing to Boris Johnson asking him to reconsider his decision.
Cllr Szanto said it was a 'very,very, sad statement to the rest of the world'.
Soon afterwards, Boris Johnson wrote to both Sussex mayors saying that London will remain a member of Mayors for Peace.
The letter to Cllr Szanto said, "I deplore acts of violence and terrorism and agree with you that cities should be spared the scourge of war."
Cllr Szanto immediately wrote to Boris Johnson saying that he was 'delighted to hear that London is rejoining Mayors for Peace'.
"I am sure that your example in supporting the movement for complete nuclear disarmament will be appreciated both in this country and around the world and will encourage more towns and cities to participate in promoting peace."
George Farebrother, secretary of Eastbourne for Peace and Liberty, said, "London is our capital city and a global hub.
"Boris Johnson's welcome reversal is therefore a matter of celebration for all of us."
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