This week's turbulence in Tokyo markets exposes a key risk of Prime Minister Shinzo Abe's all-in strategy to revive Japan's economy — if investor confidence falters, the government and the Bank of Japan may be left with few options to turn the tide.

Panicky investors dumped shares on the Tokyo market Thursday, sending the main index plunging more than seven percent on weak Chinese data after months of sharp climbs.

Prime Minister Shinzo Abe flies to Myanmar Friday bearing almost US$1 billion in development aid and a plan for a nationwide electricity grid as Japan tries to grab the box seats in the country's quickening development.

Japan on Wednesday posted its worst April trade deficit as a weak yen ramped up import costs and helped extend the run of monthly shortfalls to the longest in more than three decades.

Former World Bank President Robert Zoellick said Monday that Japan's economic drive needed accompanying structural reforms, voicing fear that recent growth could be just a “sugar high.”

U.S. investment banking giant Goldman Sachs said Monday it will start investing in Japanese renewable energy projects, with a reported US$2.9 billion outlay over the next five years.

Japan's economy expanded at a rapid clip at the start of the year, the first hard evidence that Prime Minister Shinzo Abe's sweeping stimulus is beginning to rouse consumers and businesses into action even as risks loomed in the horizon.

Japan's three largest banks on Wednesday reported healthy annual profits driven by their overseas operations, reduced costs and investment gains, but warned over the outlook for this year.

The U.S. dollar soared above 100 yen for the first time in more than four years Friday, driven by aggressive credit-easing aimed at reviving Japan's sluggish economy and improved U.S. economic figures.

Japan's automakers have wrapped up the latest earnings season on a high note, booking mostly healthy profits as a weak yen, cost-cutting and strong demand in the U.S. and Asia inflated their bottom line.