Both Democrats and Republicans in U.S. Congress dug in their heels in the ongoing dispute over domestic border security, which has become tied to further support for Ukraine, and there appears to be little signs of progress. Senate Republicans blocked a bill containing $61.4 billion in aid for Ukraine in December, largely due to the unrelated and unresolved dispute over U.S. border policy. Congress has been mired in infighting since then, as Republicans make hardline demands on border and immigration that many Democrats consider to be untenable. The latest round of comments about the failure o…