Immediately after the opening of trade the index fell even a little lower at 3.04%, or down to 16,336.13 points.
The strengthen yen positions hit the oil exporters.
Earlier, media reported Brent crude prices falling by more than 6 percent.
On Sunday, the participants of the meeting in the Qatari capital failed to reach an agreement on freezing the oil output in a bid to stabilize global crude prices.
According to the CNBC news outlet, the lack of a deal on Sunday also sent the commodity's prices tumbling in early trading hours on the New York Mercantile Exchange (NYMEX).
