BBC correspondent Will Grant reports from Havana, hours after the US charged former Cuban leader with conspiracy to kill US nationals and other crimes.
The walkout, which was due to start on Thursday, has been suspended while union members vote on a tentative deal.
In its latest update, the World Health Organization says there have now been 139 suspected deaths and 600 cases.
The BBC's Frank Gardner explained how the incident highlighted tense relations between Russia and Nato.
Castro and five others are charged with conspiracy to kill US nationals, murder, and destruction of aircraft
Rescuers removed the vehicle from near the shoreline and police arrested the driver, who was attempting to use the vehicle's "wade mode".
The spy scandal has revived fears that Austria remains a hotbed of Russian espionage activity.
The spy scandal has revived fears that Austria remains a hotbed of Russian espionage activity.
As part of the ongoing investigation into the crash that killed 14 people, officials released footage showing the engine detaching during takeoff.
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