Dollar firmer as US-Iran conflict intensifies, Brent hits $90

The dollar strengthened against global peers as Middle East tensions escalated. Oil prices surged and investor confidence remained fragile after last week's market turbulence.

Geopolitical concerns and semiconductor valuation worries weighed on market sentiment. Federal Reserve officials are debating potential interest rate increases to combat inflation.

Cryptocurrencies like bitcoin and ether saw modest gains in early trading.