The U.S. State Department approved $1.8 billion in new arms for Taiwan and submitted the package to Congress Wednesday for a final review in a move aimed at improving the island’s self-defense capabilities against a long-threatened invasion by China.

The package includes 135 SLAM-extended-range land attack missiles from Boeing Co. valued at $1 billion if the entire sale goes through, $436 million for Himars mobile artillery rocket systems made by Lockheed Martin Corp. and $367 million in surveillance and reconnaissance sensors from Raytheon Technologies Corp. to be mounted on aircraft.

The submission to Congress for a 30-day review, which is unlikely to draw opposition, comes two months after the U.S. and Taiwan completed the sale of 66 new model F-16 Block 70 aircraft from Lockheed.