U.S. Secretary of State Marco Rubio and the Trump administration’s new envoy to NATO are seeking to reassure wary NATO members of the U.S. commitment to the alliance.

Secretary of State Marco Rubio told NATO members Thursday that the US remained committed to the alliance – if they massively ramp up military spending targets.

NATO allies are readying themselves for a major ‘shift’ in responsibility for defending the continent, but diplomats told Euronews on the eve of a ministerial meeting in Brussels that the transfer of burden of responsibility is crucial to keep the US in the alliance.