LIVE UPDATES: White House Calls for Russia-Ukraine Negotiations to End Conflict

"What needs to happen is for the two sides to be able to sit down and negotiate and find a way out of this peacefully and diplomatically," the official told ABC News.

Russian armed forces have repelled the attack of Ukrainian troops near the villages of Bilogirka and Davidov Brod in the Kherson Region and eliminated some 90 Ukrainian servicemen and their munition, the Russian Defense Ministry said on Sunday.

"In the Andriivka direction, Russian troops repelled attacks of two motorized infantry companies of the Ukrainian armed forces from the villages of Bilogirka and Davidov Brod in the Kherson region. Up to 90 Ukrainian troops, one tank, 12 armored fighting vehicles and three vehicles were destroyed," the ministry said.

Ukrainian Ambassador to Minsk Igor Kyzym has been summoned to the Belarusian Foreign Ministry where the diplomat was handed a note on Kiev's presumably planned strikes at the Belarusian territory, The Ukrainian Foreign Ministry said on Sunday.

"On the evening of October 8, Ukrainian Ambassador to Minsk Igor Kyzym had been summoned to the Belarusian Foreign Ministry, where he was handed a note. In this note, the Belarusian side says that Ukraine allegedly plans to strike at the Belarusian territory," the ministry said in a statement.

The statement also said that the data "does not correspond with the reality," and that Kiev rejected "insinuations made by Belarus."

Earlier in October, Belarusian President Alexander Lukashenko said that Ukraine was continuing to stage provocations on the border with Belarus by deploying up to 15,000 military personnel.

The top official stressed that the Belarusian troops do not take part in Russia's special military operation in Ukraine, and that Minsk is set to prevent possible attacks on the Belarusian territory from Poland, Lithuania and Latvia.