CNBC Daily Open: Investors had much to cheer in 2025 — but 2026's starting out rocky

May this year prove as lucrative as 2025, when the S&P 500 rallied 16.39% mostly on the back of enthusiasm over artificial intelligence.

Other highlights of last year: Google-parent Alphabet was the most magnificent of the Magnificent Seven; Colombia's stock market was the surprise leader of the MSCI All Country World Index; silver surged over 141%, outshining its sibling gold, which itself had a phenomenal year.

And even though the first week of 2026 isn't yet over, global markets and investors already have to contend with a major geopolitical flare-up: the U.S.' attack on Venezuela.

The situation is still developing, so here's a rundown to bring you up to speed:

The oil question: President Donald Trump said the U.S.' oil companies will invest in Venezuela's energy sector. An oil consulting firm said Petróleos de Venezuela, the South American nation's state-owned oil company, still "controls the majority of the oil production and reserves." And analysts think crude prices should remain steady in the near term.

The foreign policy front: Analysts think the U.S. strike on Venezuela, despite its apparent display of forceful interference in another country, will not embolden China to do the same with regard to Taiwan.

And Danish Prime Minister Mette Frederikse is taking no chances with Trump. On Sunday, following the attack, she cautioned the U.S. to "stop the threats against a historically close ally and against another country and another people who have said very clearly that they are not for sale."

It's a lot to take in for the first Monday of 2026 — for now, we'll have to wait for the U.S. to wake up for updates on their front.