By Hyonhee Shin and David Brunnstrom SEOUL/WASHINGTON (Reuters) – North Korea recently used what would be its largest ever intercontinental ballistic missile (ICBM) system in two secretive launches, likely paving the way for a resumption of long-range tests, U.S. and South Korean officials said. North Korea froze its ICBM and nuclear tests in 2017 after launching its first missiles capable of reaching the United States. It has also not tested a nuclear weapon since then but leader Kim Jong Un has warned of a return to testing both. The escalation in North Korea tensions comes as South Korea on…

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