iShares Core International Aggregate Bond ETF offers global diversification via investment-grade, mostly sovereign bonds, with minimal credit risk and exposure to developed markets outside the US. The fund's low expense ratio and FX hedging reduce volatility, but hedging limits upside in a weak dollar environment, which is a drawback for 2025. IAGG outperformed AGG in recent years due to international rate differences, but future returns may be muted as some countries' yields rise.