The United States has criticized China after at least one of its fighter jets intermittently aimed its radar at Japanese Air Self-Defense Force aircraft. The incident took place on Saturday.
A spokesperson for the US Defense Department commented on the issue on Tuesday, saying that China's actions are "not conducive to regional peace and stability."
The person added: "The US-Japan alliance is stronger and more united than ever. Our commitment to our ally Japan is unwavering, and we are in close contact on this and other issues."
The Japanese government has lodged a strong protest with China and urged the country to take rigorous steps to prevent a recurrence.

Quiz 1:
Who did China's fighter jet aim its radar at on Saturday?
A. Russian Air Force
B. South Korean Air Force
C. Japanese Air Self-Defense Force
D. North Korean Air Force

Quiz 2:
Which country has lodged a strong protest with China due to the incident?
A. Japan
B. Russia
C. South Korea
D. North Korea

Quiz 3:
According to the article, how does the US Defense Department describe China's actions regarding the incident?
A. Peaceful and conducive to regional stability
B. Concerning and not conducive to regional peace and stability
C. Strong and decisive
D. Indifferent and unimportant

[Answer block]
Answers:
Quiz 1: C
Quiz 2: A
Quiz 3: B