Explanation

The crown prince of Saudi Arabia is the second-most important position in Saudi Arabia, second to the King, and is his designated successor. 

Mohammed bin Salman (MBS) is the current crown prince, deputy prime minister((2022) and minister of defense of Saudi Arabia (2015–22)

Mohammed was appointed crown prince on 21 June 2017, following the King's decision to depose Muhammad bin Nayef 

ND30-4-2023

Explanation

• Russia attacked Ukraine on 24 February 2022
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• On 24 February, before 5:00 a.m. Kyiv time, Putin announced a "special military operation" in eastern Ukraine and "effectively declared war on Ukraine."
• Russia retains control over 1.8% of the area around Kharkiv in the east of Ukraine
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• Reason for Russia and Ukraine War 2022:
• Throughout 2021, bilateral tensions rose due to a Russian military buildup surrounding Ukrainian territory
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• The capital of Russia is: Moscow
• The area of Russia is 17.1 million km²
• The currency of Russia is: the Russian ruble
• The population of Russia is: 144.1 million (2020) World Bank
• The continent of Russia is: Europe, Asia

Explanation

Emperor Naruhito is the 126th and current Emperor of Japan as of 1 May 2019.

Emperor Naruhito succeeded Emperor Akihito, who abdicated the throne.

Explanation

World Ozone Day also known as International Day for preservation of Ozone Layer is observed on 16 September 

Proclaimed by United Nations General Assembly (in 1994)

Theme 2023: Montreal Protocol: Fixing the Ozone Layer and Reducing Climate Change. 

Explanation