With more Americans than ever voting by mail in the November election, and President Trump's warning that the final outcome may not be known for months, the spectre of a delayed result is still a risk to financial markets despite Joe Biden's current lead in the polls. High yield bonds - sometimes considered to be the canary in the coal mine for broader risk assets - are starting to wobble, with the European market registering its first monthly negative return since March. Is it a sign of things to come? ING's Senior High Yield Credit Analyst Oleksiy Soroka explains.