He may have spent 14 hours in a plane from the UK to Japan but the European referendum campaign has followed David Cameron all the way here.
The Prime Minister is meeting other world leaders in Ise-Shima in southern Japan for the two day G7 summit.
And while Mr Cameron might have been hoping to get two days away from the ferocious campaign in the UK over our membership of the EU, he can't control what the other leaders are saying about it.
We asked the two European Presidents here, President Tusk of the European Council and President Juncker of the European Commission, if they could have a working relationship with Boris Johnson if he were to get a job in a post-referendum Cabinet reshuffle.
Mr Johnson recently compared the EU's expansion plans with the European goals of Adolf Hitler.
Jean-Claude Juncker told me that the former London Mayor should return to Brussels where he has previously spent some of his working life.
"It's time for him to come back to Brussels in order to check...if everything he is telling the British people is in line with reality," he said before adding, "I don't think so."
In recent days, Johnson has also claimed the EU stops bananas from being sold in bunches of more than three and he continues to say the UK sends £350 million each week to the EU when both the IFS and the official statistics watchdog has said the figure is "wrong".
Neither Vote Leave nor Johnson has yet responded to Juncker's comments but I suspect they may wear criticism from the EU's most senior bureaucrat as a badge of honour.
No other leader of the G7 has made any comment about Brexit yet, but they have all individually expressed their desire for the UK to vote to stay in the EU.