North Korea expands nuclear arsenal, Chinese experts say

Nuclear experts in China have revealed that North Korea may already have 20 nuclear warheads and could double that arsenal by next year, the Wall Street Journal reported Wednesday. The total exceeds current U.S. assessments of the secretive state's nuclear weapons.

The Chinese experts believe North Korea has a greater domestic capacity to enrich uranium than previously thought, Siegfried Hecker, a Stanford University nuclear expert and former head of the Los Alamos National Laboratory, told the Journal.

The Chinese estimates were shared in a closed-door meeting with U.S. nuclear specialists in Beijing this February, said the report.

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