North Korea fired off two "unidentified projectiles" from the country's west, toward the Sea of Japan on Tuesday, the South Korean military said, just hours after the nation offered to resume nuclear talks with the United States and a day ahead of a key Cabinet reshuffle in Japan.

The South's military said the two "short-range" projectiles that flew about 330 kilometers across the peninsula from near Gaechon, South Pyongan province, had reached a maximum altitude of around 50 km to 60 km. South Korean and U.S. intelligence authorities were analyzing the exact type of weapons fired, the South's Joint Chiefs of Staff said in a statement.

"Our military is monitoring the situation in case of additional launches and maintaining a readiness posture," it added.