US Central Command shot down two Iranian one-way attack drones that threatened international maritime traffic in the Strait of Hormuz, it said a statement posted on social media Sunday. There were no reports of damage.

On Friday, six ballistic missiles fired at Bahrain and Kuwait were intercepted and another failed to reach their intended target, hours after four unmanned craft headed to Hormuz were shot down, Centcom said. It added the US military struck Iranian coastal surveillance radar sites in Goruk and on Qeshm Island in return.

In Washington, the Trump administration is floating a plan to steer Iranian assets in the US toward helping US allies in the Persian Gulf rebuild from damage inflicted by Tehran and to repair any future destruction.

With negotiations for ending the war bogged down over Tehran’s insistence on the release of $24 billion in frozen Iranian financial assets, the approach risks further chilling talks on a truce extension, reopening the Strait of Hormuz and future talks over Iran’s nuclear program.

The escalation in missile fire comes as Washington and Tehran fail to make headway in negotiations. Several sticking points remain besides the assets, including a parallel ceasefire between Israel and Lebanon.

Pakistan’s Interior Minister Mohsin Naqvi arrived in Tehran on Saturday to deliver a message from army chief Asim Munir to Iranian Supreme Leader Mojtaba Khamenei, the semi-official Iranian Students’ News Agency reported.

US President Donald Trump, who has insisted for months that Iran was near its breaking point, conceded Friday that the country retains some missile and drone capacity. In an interview with NBC News, he said about 21% to 22% of Tehran’s missile arsenal remains.

“It’s a lot of missiles, but it’s not what it was when we first attacked,” he told the television network during a visit to Wisconsin.

Earlier Friday, he told reporters the US is “having great success with Iran,” and “they’re in no position to have a nuclear weapon.”

The ceasefire saw its biggest test on Wednesday, when Iranian strikes killed one person at Kuwait’s main airport and injured dozens. Bahrain was also attacked and the US struck an oil tanker headed to the Islamic Republic. Kuwait, a staunch US ally, has been one of Tehran’s main targets during the truce agreed in early April.