Historically, Trump's confrontational stance towards other nations, particularly Russia, has led to increased market volatility. The mention of 'really bad things' happening to Russia may be perceived as a threat, potentially escalating tensions and affecting global markets. This could negatively impact stocks related to international trade, diplomacy, and defense. Additionally, the energy sector may be affected due to Russia's significant role in global energy markets. The lack of clarity on what 'really bad things' refers to may also contribute to market uncertainty, leading to a bearish sentiment. However, it's essential to consider the context of Trump's statement and the potential for diplomatic efforts to mitigate the situation.