Dario Amodei says the "toughest dilemma" about his proposal to "pace the frontier" is what happens if China does not do the same (Ashley Capoot/CNBC)

Ashley Capoot / CNBC: Dario Amodei says the “toughest dilemma” about his proposal to “pace the frontier” is what happens if China does not do the same — Anthropic CEO Dario Amodei said Sunday that the “toughest dilemma” about his proposal to slow the advancement of artificial intelligence …