More than 20 nations will attend Germany's meeting on Ukraine, the US Department of Defense (the Pentagon) spokesman John Kirby said.
In a statement, Kirby added that the meeting will discuss Kyiv's long-term defense needs.
Earlier, UK Prime Minister (PM) Boris Johnson acknowledged that Russia's takeover of Ukraine is a "realistic possibility," adding that the situation is "unpredictable".
The Russian-Ukrainian war has entered its second month as thousands of soldiers from both sides have been killed and millions have been displaced from the Ukrainian side since the start of Russian operations in Ukrainian territory on February 24.
Several countries have imposed significant economic sanctions on Moscow, while Russia has responded by imposing personal sanctions on a number of American and Canadian leaders.