Geopolitical tensions often lead to market uncertainty. The U.S. military support to Ukraine could escalate tensions, affecting investor sentiment and possibly leading to increased volatility in the markets. As SPY is a broad market ETF, it's susceptible to shifts in market sentiment, making it likely to experience short-term price fluctuations.

The U.S. decision to send more long-range missiles to Ukraine could exacerbate geopolitical tensions in Europe. This development may affect European markets and, by extension, VGK, which tracks European stocks. Investors in VGK should be aware of the potential for increased market volatility and geopolitical risks in the region.