It's after the resignation of Edouard Philippe who has been in the post for three years.
Mr Castex, 55, is relatively unknown in France, although he is a senior civil servant.
The new Prime Minister has been a key player in the government's response to the Covid-19 pandemic.
Lebanon moves towards accepting ICC jurisdiction for war crimes on its soil
Lebanon has moved towards accepting the International Criminal Court's jurisdiction to prosecute violations on Lebanese territory since October, in what Human Rights Watch said on Saturday was a "landmark step" towards justice for war crimes.
Zelenskiy issues new appeal for air defences, fast weapon supplies
Ukrainian President Volodymyr Zelenskiy issued a new appeal for air defences and fast weapons deliveries after the latest Russian strike on the Ukrainian energy sector on Saturday.
Russia will seek to overcome EU sanctions on LNG operations
Russia will look for ways to overcome what it regards as any illegal sanctions the European Union imposes on its liquified natural gas (LNG) operations, the Kremlin said on Saturday, saying any measures would backfire on European industry.
Abbas, international leaders to hold Gaza talks in Riyadh this week
Palestinian President Mahmoud Abbas and several international officials will be in Riyadh this week for talks aimed at pushing for a peace agreement in Gaza to be held on the sidelines of a World Economic Forum meeting, the WEF's president said on Saturday.
Kyiv evacuates two hospitals over fears of airstrike
The Ukrainian capital Kyiv evacuated two civilian hospitals on Friday after the head of the Belarusian KGB security service said they were housing soldiers, sparking fears of an airstrike.
Authorities in Sharjah have denied rumours of a tiger being on the loose in the emirate.
The 16th group of wounded Palestinian children and cancer patients arrived in the UAE early on Saturday, April 27.
An earthquake measuring 2.8 was recorded in Khor Fakkan Coast at 03:03 (UAE time) on 27th April 2024, according to the National Seismic Network of the National Centre of Meteorology (NCM).
