Ukrainian President Volodymyr Zelensky will on Saturday address the US Senate concerning the ongoing battle against the Russian invasion, a US legislative aide said.

Hindustan Times reported that Zelensky will speak to senators via video conference in the morning Washington time at the request of Ukraine.

Also read: Russia-Ukraine conflict: A brief history

As the war in Ukraine intensifies, some US lawmakers are urging the US President Joe Biden to take a tougher stance against Russia, such as by suspending imports of its oil.

The White House has ruled this out so far, fearing it might cause rising oil prices to go up even more and hurt US consumers stung by record inflation.

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Republican Senator Lindsey Graham has called for “somebody in Russia” to assassinate President Vladimir Putin.

Zelensky is strongly urging NATO to enforce a no-fly zone over Ukraine to halt bombing raids but the Biden administration has ruled this out, fearing it might lead to an all-out war between the West and Russia, although some US lawmakers support the creation of such a zone.

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As Russian forces pressed their campaign on multiple fronts Friday and seized the biggest nuclear power plant in Europe, the number of refugees fleeing Ukraine eclipsed 1.2 million.

Days after an ambush in which several people lost their lives, a bullet-ridden bus still sat in a roadway in the capital city of Kyiv. Not far away, Ukrainian militia members buried a comrade.

Also read: ‘World must not watch, but help’: Zelensky slams NATO’s no-fly zone stance

In a week-old offensive, the Russian military has launched hundreds of missiles and artillery attacks on cities and other sites across the country.