The United States hopes to enlist allies — possibly including Japan — over the next two weeks or so in a military coalition to safeguard strategic waters off Iran and Yemen, where Washington blames Iran and Iran-aligned fighters for attacks, the top U.S. general said on Tuesday.

Under the plan, which has only been finalized in recent days, the United States would provide command ships and lead surveillance efforts for the military coalition. Allies would patrol waters near those U.S. command ships and escort commercial vessels with their nation's flags.

Marine Gen. Joseph Dunford, the chairman of the Joint Chiefs of Staff, articulated the details to reporters following meetings on Tuesday with acting U.S. Defense Secretary Mark Esper and Secretary of State Mike Pompeo. "We're engaging now with a number of countries to see if we can put together a coalition that would ensure freedom of navigation both in the Straits of Hormuz and the Bab al-Mandab," Dunford said. "And so I think probably over the next couple of weeks we'll identify which nations have the political will to support that initiative and then we'll work directly with the militaries to identify the specific capabilities that'll support that."