The US and Japanese national flags are hoisted next to a traditional Okinawan Shisa statue at the US Marine's Camp Foster in Ginowan. Thomson Reuters WASHINGTON (Reuters) - The US government has approved the sale of anti-ballistic missiles to Japan to defend itself against a growing nuclear and missile threat from North Korea, a State Department official said on Tuesday.

News of the sale comes as North and South Korea hold their first talks in more than two years aimed at solving the crisis over the North's nuclear missile program.

The missile deal follows a year of ramped-up North Korean missile launches, some of them over Japanese territory, and its sixth and most powerful nuclear test. These actions have prompted a stepped-up US-led campaign to toughen UN sanctions, which Pyongyang has called an act of war.

The State Department on Tuesday asked Congress to approve the $133 million sale of the four missiles and related hardware, which can be launched from destroyers at sea or from a land-based system.

The Missile Defense Agency conducts the first intercept flight test of a land-based Aegis Ballistic Missile Defense weapon system from the Aegis Ashore Missile Defense Test Complex in Kauai, Hawaii, December 10, 2015. REUTERS/U.S. Missile Defense Agency/Leah Garton/Handout via Reuters

The sale of the anti-ballistic missiles, made by Raytheon Co and BAE Systems, follows through "on President Trump's commitment to provide additional defensive capabilities to treaty allies threatened by the DPRK's provocative behavior," the official said, using the initials for North Korea.

Japan formally decided in December it would expand its ballistic-missile-defense system with US-made ground-based Aegis radar stations and interceptors.

The proposal to build two Aegis Ashore batteries without the missiles will likely cost at least $2 billion and was not likely to be operational until 2023 at the earliest, sources familiar with the plan told Reuters in December.

US Secretary of Defense James Mattis and Japan Minister of Defense Itsunori Onodera, in a phone call on Monday, "condemned North Korea's reckless and unlawful behavior," according to a Pentagon statement.

(Reporting by Chris Sanders; editing by James Dalgleish)