US President Barack Obama will propose major cuts in US and Russian nuclear stocks, making a pitch for his own place in history in an evocative open-air speech during his first visit as president to Berlin.
Almost 50 years to the day since John Kennedy declared 'Ich bin ein Berliner' and 26 years since Ronald Reagan exhorted 'Tear down this wall!' Obama will unveil plans on Wednesday for a one third reduction in Cold War nuclear arsenals.
Obama will use the speech at the Brandenburg Gate to propose cutting US and Russian strategic nuclear warheads to around 1000 each, and also seek cuts in tactical nuclear arms stocks in Europe.
It remains unclear whether Russian President Vladimir Putin, with whom Obama had a frosty meeting in Northern Ireland on Monday, will agree to such substantial weapons cuts.
Russia has previously demanded changes to the US missile defence system before agreeing to return to the nuclear agenda.
The president will also commit to attending a nuclear security summit in The Hague next year, and to hosting his own version in 2016 in the last year of his presidency.
Obama inaugurated the first such summit, designed to ensure unsecured nuclear stocks do not fall into the hands of terrorists, in Washington in 2010 and went to a follow-up meeting in Seoul two years later.
His announcement on Wednesday is intended to ensure that his nuclear counterproliferation agenda remains at the centre of his foreign policy legacy, following the conclusion of a Strategic Nuclear Arms Reduction Treaty with Russia during his first term.
Though he remains popular in Germany, Obama will struggle to meet the expectations he spun for himself as a presidential candidate, in a speech to 200,000 Berliners in 2008 that made him a political star in Europe.
Since that call for a joint US-European bid to 'remake the world' by battling terrorism, global warming, Middle East violence and poverty, Obama has learned the power of the status quo at home and abroad to thwart change.