White House National Security adviser Robert O’Brien on Wednesday expressed sympathy for France’s account of events in a Mediterranean naval standoff with Turkey last month over a Libyan arm smuggling allegation.

“NATO allies shouldn’t be turning fire control radars on each other. That’s not good,” O’Brien told reporters in France. “We are very sympathetic to French concerns.”

While Paris has accused three Turkish ships of harassing a French vessel and flashing their radar lights at it, O’Brien acknowledged that Ankara has offered a different account of the event. O’Brien also suggested that President Donald Trump would be available to mediate the dispute between French President Emmanuel Macron and Turkish President Recep Tayyip Erdogan.

Why it matters: France said Turkish forces harassed its ship after it attempted to inspect a Tanzania-flagged vessel suspected of carrying arms to Libya in violation of the United Nations arms embargo. France is closer to Libyan warlord Khalifa Hifter in the dispute, while Turkey has committed forces to support the rival Government of National Accord, based in Tripoli. O’Brien’s remarks came after Trump and Erdogan discussed Libya in a phone call Tuesday. The United States has urged both Hifter’s forces and the Government of National Accord, as well as their myriad of foreign backers, to commit to the UN peace process and disband their militias.