North Korea has fired two unspecified ballistic missiles off its east coast, Seoul’s joint chiefs of staff said on Wednesday. The launches early in the day were less than an hour apart and came days after South Korea and US leaders agreed to scale up joint military drills and deployment of American weapons. Japan’s coast guard also reported a suspected ballistic missile launch by North Korea. US president Joe Biden and his new South Korean counterpart, Yoon Suk-yeol, agreed on Saturday to hold bigger military drills and to deploy more US strategic assets if necessary to deter North Korea’s intensifying weapons tests. But they also offered to send Covid-19 vaccines to Pyongyang, as the isolated North is battling its first confirmed outbreak.