[1] In 2002, relations between the United States and Ukraine deteriorated after one of the recordings made during the Cassette Scandal revealed an alleged transfer of a sophisticated Ukrainian defense system to Saddam Hussein's Iraq.

[3][4][5] Following the 2014 annexation of Crimea by the Russian Federation, the United States began to supply military aid to Ukraine[6] and became one of the largest defense partners of the country.

[11] In December 2022, during a surprise visit to Washington D.C., Ukraine President Volodymyr Zelenskyy gave a speech to a joint session of Congress.

6 of the Ministry of Foreign Affairs, the Extraordinary Diplomatic Mission of the Ukrainian People's Republic was sent to the United States of America, headed by Yevhen Holitsynsky (later replaced by Yulian Bachynsky in the status of "temporary acting Chairman").

Although some agreements were reached, neither of the states provided any actual support as in general their agenda was to restore Poland and unified anti-Bolshevik Russia.

Bilateral relations suffered a setback in September 2002 when the federal government of the U.S. announced it had authenticated a recording of President Leonid Kuchma's July 2000 decision to transfer a Kolchuga early warning system to Iraq.

[17] In January 2022, the U.S. put 5,000–8,500 troops on high alert as tensions escalated in the Russo-Ukrainian War,[18] expressing willingness to further help defend Ukraine before and when Russia launched its invasion a month later.

[23][24] In the 2022 State of the Union Address, which was attended by Ukrainian Ambassador Oksana Markarova, U.S. President Joe Biden heavily criticized the invasion and pledged American support for Ukraine.

[25] In May 2022, the U.S. Senate confirmed Bridget Brink to serve as ambassador to coincide with the reopening of the US embassy in Kyiv after it had closed due to the invasion.

The speech included references to Franklin D. Roosevelt's declaration of war on Japan and thanked the American congress and people for their support of Ukraine.

[31] In April 2024, Ukraine received small arms and ammunition from Washington, which were intercepted while en route from Iranian forces to rebels in Yemen supported by Tehran.

[38] In 2012 the United States Senate Committee on Foreign Relations passed Resolution 466, calling for the unconditional release of political prisoner Yulia Tymoshenko and implemented a visa ban against those responsible.

[39] The resolution condemned the administration of Ukrainian President Viktor Yanukovych (in office from 2010 to 2014) and asked NATO to suspend all cooperative agreements with Ukraine.

[40] In response, First Deputy General Prosecutor of Ukraine Renat Kuzmin wrote a letter to U.S. President Barack Obama, complaining that his visa was revoked.

[6] Though the U.S. had sanctioned Russia and refused to recognize the annexation, after a year Obama declined to provide the requested lethal aid (such as FGM-148 Javelin anti-tank missiles and F-16 fighter jets).

[6] The Obama administration did supply $600 million of non-lethal military aid from 2014 to 2016, including vehicles, training, body armor, and night-vision goggles.

[6] In 2018 the U.S. House of Representatives passed a provision blocking any training of Azov Battalion of the Ukrainian National Guard by American forces, citing its neo-Nazi background.

[51] Trump held a meeting with Zelenskyy in New York City on September 25, where they both stated that there was no pressuring during the July phone call and that nothing out of the ordinary had occurred.

[53][54][26] The United States had pledged $2.175 billion in military aid to Ukraine, which included the Ground Launched Small Diameter Bomb (GLSDB), a new rocket doubling the country's strike range in its conflict with Russia.

The aid package also funded other weapons and equipment, such as air defense firing units, counter-drone systems, and precision-guided munitions.

In early February 2023, 11 House Republicans led by Florida Rep. Matt Gaetz, introduced what they called the "Ukraine Fatigue Resolution" (H.Res.