On Tuesday, the Security Council will hold a meeting dedicated to Ukraine.

Ukrainian President Volodymyr Zelenskiy said he would address the UN Security Council on Tuesday and believes that more serious cases of mass killings of civilians by Russian troops will be discovered in the future.

At a meeting of the Security Council on Tuesday, Ukraine’s accusation of the murder of civilians by Russian soldiers in Bucha, northwest of Kyiv, will be considered.

Russia categorically rejected the accusations, calling them “criminal provocations,” and said it would present “empirical evidence” to the Security Council that its forces were not involved in the atrocities.

The Ukrainian leader has already made a video call to more than a dozen parliaments, including the U.S. Congress, the British Parliament and the European Parliament.