The UN Security Council has condemned the seizure of about 20 peacekeepers by armed fighters in the Golan Heights area and demanded their release.
Russian Ambassador to the UN Vitaly Churkin, this month's president of the 15-nation council, told reporters:
The members of the Security Council strongly condemned the detention of a group of more than 20 peacekeepers ... by armed elements of the Syrian opposition.
More top news
In the unexpected announcement on Monday, Mr Key said it was the "right time" to leave politics.
As the Government's Brexit appeal comes to the Supreme Court, here's a look at what you need to know.
According to local reports, the man was found by friends in their accommodation in Val Thorens resort in the Alps on Sunday morning.