A deal to provide further US assistance to Ukraine by year-end appears to be increasingly out of reach for President Joe Biden. The impasse is deepening in Congress despite dire warnings from the White House about the consequences of inaction. Regardless, Republicans (GOP) insist on pairing the aid with changes to America’s immigration and border policies. After the Democratic president said this past week he was willing to “make significant compromises on the border,” Republicans quickly revived demands that they had earlier set aside, hardening their positions and attempting to shift the neg…