As the Democratic Party has taken control of both the federal Senate and House of Representatives in the U.S. midterm elections, attention is focusing on the impact this will have on the Russia-Ukraine war, which has been ongoing for nearly five years.

Voices advocating for Ukraine's position are expected to grow louder in the U.S. Congress.

The Democratic Party has recently voiced criticism regarding U.S. President Donald Trump's easing of sanctions against Russia.

There are also projections that related legislation could gain momentum by adding aid provisions for Ukraine to standalone bills related to Russian sanctions or Ukraine aid, or to essential legislation such as defense appropriations bills.

The possibility that oversight of the Trump administration could be strengthened through congressional powers such as the impeachment power held by the legislature is also positive for Ukraine.

Questions still remain surrounding the delayed approval of Patriot missile support for Ukraine and restrictions on Starlink services.

These are issues that raised suspicions that the Trump administration might be trying to pressure Ukraine to halt its attacks on Russian oil refineries after concluding a "diesel deal" involving massive imports of Russian diesel.

Representative Gregory Meeks, the top Democrat on the House Foreign Affairs Committee, told the Ukrainian media outlet The Kyiv Independent, "We will pass legislation compelling the provision of the security, economic, and intelligence assistance to Ukraine necessary to protect it from Russia's brutal and illegal invasion."

However, President Trump's presidential veto remains a major variable that can constrain congressional power.

Overriding a presidential veto requires a two-thirds majority vote in both the Senate and the House.

Even if bills pass in Congress, there is also the possibility that the Trump administration could thoroughly ignore them.

The broad anti-Russia sanctions bill, the "Graham Act," is a representative example.

The Graham Act aims to impose high tariffs on countries purchasing Russian energy and other goods.

Although it was enacted into law last September, President Trump suspended the implementation of the Graham Act and exempted Russia from sanctions when he struck the diesel deal with Russia last month.

President Trump's foreign policy style, which is accommodating toward Russia, also remains an uncertainty for Ukraine.

The surprise diesel deal with Russia announced by President Trump last month was criticized as running counter to the anti-Russia sanctions imposed by major Western countries.

The ongoing controversy over Ukraine being "passed over" while the U.S. mediates peace negotiations between Russia and Ukraine is in the same context.

While U.S. special envoys pushing for peace negotiations have visited Moscow eight times, they have visited Kyiv only once last September.