Paris and Washington pledged Wednesday to reenforce their cooperation in space, particularly on exploration and climate, during a visit by France's Emmanuel Macron to NASA headquarters alongside US Vice President Kamala Harris.

The French president, on a state visit to the United States, highlighted the American lunar program Artemis, whose first uncrewed test mission launched in mid-November with participation of the European Space Agency (ESA).

"We are very keen" to participate, he told Harris, adding with a smile: "It's very important for us, as long as you can propose a French leader to fly to the Moon quite rapidly," he said, in a nod to French astronaut Thomas Pesquet, who joined Macron for the NASA visit.