So, bonds basically all tend to converge on the same risk adjusted yield. If you're seeing yields that look like this, the market believes the currency will slip or there's repayment risk (relative to USD bonds that are in the 4.75% range.)

Imagine you have a scenario where inflation is 0 in currency A and 10% in currency B. Would you rather have a 2% bond in currency A or a 9% bond in currency B? This is why Euro bonds go negative sometimes, when USD interest rates were very low and the Euro was deflationary relative to the dollar, it could push rates even further lower.