* Regional tension mounts after Pyongyang's missile test
* Yen advances to 5-month highs vs dollar, euro, sterling
* US Treasury's currency report taken in stride
* US declines to name any trade partner as currency manipulator (Updates prices, adds details and quotes)
TOKYO, April 17 (Reuters) - The dollar dipped to a five-month low against the yen on Monday as rising tensions over North Korea kept the safe-haven Japanese currency in demand.