By Ben Blanchard and Ann Wang TAIPEI, June 30 (Reuters) - Taiwan's President Lai Ching-te warned military cadets on Tuesday not to succumb to China's spying activities and to defend freedom and democracy, speaking at a Cold War-era college originally set up to teach against the perils of communism. Taiwan and China, which views the democratically governed island as its own territory, have long ​spied on each other, and Taiwan in particular has reported an increased number of ​Chinese espionage cases, especially in the armed forces.