The Nikkei 225 Index declined 0.8% to below 56,500 on Monday, giving back part of last week's gains as oil prices spiked following the failure of US-Iran negotiations over the weekend in Islamabad.
President Donald Trump also announced plans for a blockade of the Strait of Hormuz and is reportedly considering renewed strikes on Iran, raising concerns over a broader escalation in the global energy crisis.
In Japan, the benchmark 10-year JGB yield rose to around 2.49%, its highest level since 1997, as surging energy costs strengthened expectations of a near-term Bank of Japan rate hike.
Tech stocks led losses, with declines in Kioxia Holdings (-1.1%), Lasertec (-2.4%), Tokyo Electron (-3.5%), Advantest (-1%), and SoftBank Group (-1.3%).
Broader index heavyweights also weakened, including Sumitomo Electric (-2.4%), Fast Retailing (-1.1%), and Nintendo (-1.2%).

Sumber : Trading Economics