By Andrew MacAskill

LONDON (Reuters) -Britain’s domestic spy agency MI5 issued a rare public warning to members of parliament on Monday that they are being targeted by spies from China, Russia and Iran in an attempt to undermine the country’s democracy.

The warning comes a week after prosecutors said they had to abandon the trial of two British men charged with spying on members of parliament for China because the British government had not provided evidence showing China was a threat to its national security.

MI5 warned politicians and their staff to look out for spies seeking to elicit information from them by blackmail or phishing attacks, cultivating long-term and deep relationships with them, or making donations to influence their decisions.

“When foreign states steal vital UK inf

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