Among exchange-traded funds, the Nasdaq 100 tracker Invesco QQQ Trust (NASDAQ: QQQ) is up by 0.46% on Monday, while the SPDR S&P 500 ETF (NYSEARCA: SPY) is down by 0.052%. On Sunday, White House national security advisor, Jake Sullivan, warned that Russia could launch an invasion on Ukraine this week, but is still holding out hope that diplomacy can prevail. This week, investors can also expect more key inflation data, with January’s producer price index that will be released on Tuesday and another round of big earnings from companies like Nvidia (NASDAQ: NVDA) and Walmart (NYSE: WMT).