John Key is fighting off claims that he's already signed New Zealand up to the fight against ISIS.

New Zealand's chief of defence has been at an ISIS strategy meeting in Washington today addressed by President Obama, but the Prime Minister insists it was just a regular meeting and no decision to go to war has been made.

Chief of defence Tim Keating was among 21 countries' top brass to meet with Obama today with the President stating "Our coalition is united behind this long term effort".

However unlike the other participants, New Zealand hasn't actually joined the "coalition of the willing" fighting ISIS.

But Labour's Phil Goff begs to differ and says "You are not at that meeting unless you are prepared to make a contribution, I think John Key has pre-empted consultation".

Mr Key says no decision has been made and claims the Defence Force told him the summit was a routine meeting of generals.