This points to the fact that there is not a ‘pro-Ukrainian’ political party in the US. Policies are very much dependent upon the personality of the president, the situation on the ground and the geopolitical situation during the period of time he is in office. Democrats and Republicans have therefore been both pro-Ukrainian (Clinton, the younger Bush) and Russia-first (the older Bush and Obama).
The same was true during the Cold War.
Republican US Presidents Richard Nixon and the elder Bush supported détente with the USSR, and in the latter, cooperation with Soviet leader Mikhail Gorbachev. Meanwhile, the greatest support given to Ukraine was by Democratic President Jimmy Carter and especially Republican President Ronald Reagan, both of whom were ideological presidents who competed with the USSR over human rights, democracy, national rights, geopolitical and military issues.