Biden snapped at Zelenskyy in a June phone call when he asked for more aid, report says, in a fleeting moment of conflict between the two leaders

• Biden and Zelenskyy had a tense phone conversation in June, NBC News reported.
• The leaders were discussing a US military aid package when Zelenskyy suggested he needed more help.

President Joe Biden snapped at President Volodymyr Zelenskyy in a June phone call when the Ukrainian leader asked for more aid, NBC News reported.

The new details show there was a tense moment in the two leaders' relationship, even though Biden then publicly expressed unwavering support for Ukraine and he has only increased US assistance since.

The two leaders had the tense phone conversation on June 15, almost four months after Russia first launched its invasion of Ukraine. Communications between the two have been frequent since the invasion began.

Biden was telling Zelenskyy about a $1 billion military aid package that he had just been approved when the Ukrainian leader started listing all the additional help he needed, the four people familiar with the call told NBC.

This prompted Biden to raise his voice and tell Zelenskyy that he should show more gratitude, NBC reported.

A source familiar with the conversation told NBC that the exchange wasn't heated or angry, but Biden was direct with Zelenskyy.

Biden said publicly after that call that "together with our allies and partners, will not waver in our commitment to the Ukrainian people as they fight for their freedom."

And Biden has only increased his support for Ukraine since the call, as he announced multiple military packages for the country and condemned Russia's actions there.

Administration officials told NBC that the two leaders' relationship has only improved since the call.

Biden said later in June that the US would back Ukraine "as long as it takes," and has made multiple similar comments since.

The US Congress has approved around $60 billion in military, economic, and humanitarian aid for Ukraine, made up of many smaller packages, since Russia invaded.

The US is ranked seventh out of the world's countries by for the amount of money it has given to Ukraine since Russia invaded relative to its GDP, according to the Kiel Institute for the World Economy.

Lawmakers from both sides have been supportive of the aid sent to Ukraine.

However, some Republicans have started argued against sending large sums of money to the country.