Prime Minister Shigeru Ishiba on Saturday vowed to strengthen Japan's defense capabilities in the face of a severe security environment amid the growing military activity of China, Russia and North Korea.Ishiba, who took office on Oct. 1, said a recent violation of Japanese airspace by China and Russia was "utterly unacceptable," adding the two countries along with repeated ballistic missile tests by North Korea pose complex security challenges.Japan will "certainly implement" measures to fundamentally bolster its defense capabilities, the prime minister said in a speech at a Ground Self-De…READ FULL ARTICLE