美国罗纳德里根号航母抵达日本

One of the most advanced U.S. aircraft carriers has docked at its new home in Japan - the latest sign of deepening military ties between Washington and Tokyo.

The nuclear-powered, Nimitz-class USS Ronald Reagan was welcomed by Japanese officials as it arrived in the port of Yokosuka on Thursday, one day ahead of schedule.

At a ceremony, U.S. Secretary of the Navy Ray Mabus said the substance and symbolism of the carrier's presence "cannot be overstated."

The USS Ronald Reagan is one of only 10 Nimitz-class U.S. aircraft carriers in existence. It replaces the USS George Washington, which is headed back to the U.S. for maintenance work and upgrades.

In a statement, Japan's foreign ministry welcomed the arrival of the carrier, saying it will "contribute to the security of Japan and the maintenance of peace and security of the region."

Some local groups have expressed opposition to the carrier's presence. On Thursday, a group of protesters in a small boat sailed next to the massive warship with a sign that read, "You are not welcome here."

There has long been some local resistance to the U.S.-Japan defense alliance, which has placed nearly 50,000 American troops and some of Washington's most expensive military hardware in the country.