(Updates with index/price moves and geopolitical news from the first paragraph.)

US equity indexes rose as mega-cap technology names perked up amid sliding government yields and crude oil after midday Monday.

The Nasdaq Composite jumped 2% to 27,054.7, the S&P 500 climbed 1.4% to 7,754.6, and the Dow Jones Industrial Average advanced 0.6% to 52,014.8.

The communication services sector was among the top gainers, while energy led a trio of decliners.

Among stocks with market capitalization exceeding $200 billion, Arm (ARM), Intel (INTC), and Advanced Micro Devices (AMD) led the top 10, according to data compiled by Finviz. Advanced Micro Devices traded above $1 trillion intraday.

Most US Treasury yields declined, with the 10-year yield down 4.3 basis points to 4.95%, retreating from its highest level since 2007.

The front-month US West Texas Intermediate crude oil contract slumped 5.4% to $94.89 per barrel, while the global benchmark North Sea Brent dropped 4.5% to $99.18 per barrel.