Historically, positive developments in geopolitical tensions have led to increased market confidence and a subsequent rise in stock prices. Trump's congratulatory tone towards the Russia-Ukraine prisoner swap may signal a potential easing of tensions, which could have a bullish effect on the stock market. The mention of 'something big' implies that Trump is hopeful for further diplomatic progress, which could lead to increased investor optimism. However, the impact may be limited by the fact that the post does not provide concrete details on the swap's terms or its implications for the ongoing conflict. Nevertheless, the overall tone of the post suggests a positive development, which could contribute to a bullish market sentiment. The potential for de-escalation in the region could also lead to increased trade and economic cooperation, further bolstering the stock market. Key sectors that may benefit from this development include defense, energy, and emerging markets.