Context
A nuclear weapons control treaty between the US and Russia expired in February, leaving the world's biggest nuclear arsenals without major guardrails. The UN has urged both sides to agree a new framework without delay. Trump has said he could replace the deal with a better agreement which included China, which has been building up its arsenal.
Trump will arrive in Shenzhen late on Wednesday for the two-day summit between the 21 member states. He will also take part in bilateral talks with Xi on Thursday - their fourth meeting since the US president returned to office in 2025. Trump's trip will also include attending an Association of Southeast Asian Nations (Asean) summit in the Philippines on Tuesday.