April 28 (Reuters) - South Korean President Yoon Suk Yeol said on Friday it was necessary to ensure Russia’s invasion of Ukraine does not succeed and that Seoul was considering its options when it came to lethal aid to Kyiv. "If we were to accept nuclear weapons by North Korea, South Korea may have to possess nuclear weapons... and this would lead to a situation of disarmament. Yoon said the Washington Declaration required Seoul to keep respecting the nuclear Non-Proliferation Treaty and not acquire its own nuclear weapons. He said there were opinions in South Korean society that said Seoul should acquire nuclear weapons and had the technological capabilities for this, but it was complex equation about politics and economics too. "Those opinions saying that we need to have our own nuclear arsenal are not considering all these things."

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