Can Japan's currency intervention keep yen afloat?

The Japanese government has intervened in the currency market by buying the yen and selling the dollar for the first time in more than 24 years. The move was intended to keep afloat the value of the yen, which has so far declined over 25% against the dollar in 2022. Did the intervention have any effect? Why did the government act? Will there be more yen-buying? NHK World asked an expert.