The missiles fly at nine times the speed of sound, with a range of more than 1,000 km (620 miles), Russia says. They form the centrepiece of its hypersonic arsenal, along with the Avangard glide vehicle that entered combat duty in 2019.
One short-range ballistic missile crossed the Northern Limit Line, the de facto maritime border between the two countries, prompting a rare warning for residents on the island of Ulleungdo to seek shelter in bunkers.
The Ministry of Defense will get a record 5.34 trillion yen ($51.7 billion) for the year starting in April, up 1.1% from this year. With Suga’s large majority in parliament, enactment of the budget is all but certain.
The launch comes after the navies of South Korea, the United States and Japan staged trilateral anti-submarine exercises on Friday for the first time in five years, and follows a visit by US Vice President Kamala Harris to the region this week.
Viewing the drills as a military threat, North Korea decided to stage "the simulation of an actual war” to check and improve its war deterrence and send a warning to its enemies, KCNA said.
"Kyiv is well aware that such a step would mean a guaranteed escalation to a World War Three," deputy secretary of the Security Council of the Russian Federation, Alexander Venediktov, told the state TASS news agency on Thursday.