Japan aims to "drastically strengthen" its defense capabilities, according to an economic policy draft seen by Reuters, as officials worry that Russia's invasion of Ukraine could prompt instability in East Asia.

Prime Minister Fumio Kishida, meeting U.S. President Joe Biden on Monday, pledged to "substantially increase" Japan's defense budget.

The draft, a long-term economic outline that is updated annually, does not give details about spending, but says for the first time: "There have been attempts to unilaterally change the status quo by force in East Asia, making regional security increasingly severe."