Zimbabwean President Robert Mugabe travelled to Singapore for a medical checkup, a spokesman has said, days after he celebrated his 93rd birthday by vowing to add to his 36 years in charge of the nation.

As Mugabe flew to Singapore yesterday, nurses at public hospitals joined junior doctors in a two-week strike that is meant to pressure Mugabe's Government into paying 2016 bonuses due in December.

Increasingly frail, Mugabe now struggles to walk and is seldom far from the arms of an aide. His public speeches have become meandering and repetitive.

Mugabe frequently travels to Singapore for medical checks, with aides saying he suffers from an eye cataract. But reports in private media suggest he has prostate cancer, something Mugabe's office denies.

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The veteran leader's critics say his overseas medical trips testify to the collapse of Zimbabwe's public health system since the economy started to fall apart in 2000.