Taipei prosecutors indicted four people on Tuesday suspected of spying for China in a case that reached Taiwan's presidential office, seeking jail terms of more than 18 years.
Democratically-governed Taiwan says it has faced heightened military and political pressure over the past five years or so from Beijing, which views the island as sovereign Chinese territory, a position Taipei's government rejects.
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The Taipei prosecutors said in a statement that their suspected crimes included divulging or delivering classified national security information to China.
Jail sentences of 18 years or more are being sought, the statement added.
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