On Sunday, Ukraine called on Belarus to pull back what it described as significant levels of Belarusian forces and equipment deployed at their common border.
The Ukrainian foreign ministry warned Belarus against making "tragic mistakes" while under pressure from Moscow.
A ministry statement urged the Belarus armed forces "to stop unfriendly actions" and withdraw their troops out of range of the border.
The ministry said Belarus special forces and former Wagner mercenary fighters were among the troops at the border.
Their equipment included tanks, artillery, air defence systems and engineering equipment, located in the Gomel region near Ukraine's northern border.
The statement said Ukraine "has never taken and is not going to take any unfriendly actions against the Belarusian people".
Belarusian President Alexander Lukashenko said on 18 August that Ukraine had stationed more than 120,000 troops at the border with Belarus, and deployed nearly a third of its armed forces along the entire border.
Belarus said that it sent aircraft, air defence forces and armour to its border with Ukraine last Monday.
US President Donald Trump said on Tuesday the US was making progress in its efforts to negotiate an end to war with Iran, including winning an important concession from Tehran, while media outlets reported Washington had sent a 15-point settlement proposal.
The Pentagon is expected to send thousands of soldiers from the army's elite 82nd Airborne Division to the Middle East, according to reports on Tuesday, adding to the massive military buildup even as the Trump administration seeks talks with Iran.
The National Transportation Safety Board said on Tuesday that a system which would have allowed a New York airport controller to track movement of aircraft and vehicles did not alert during a Sunday night fatal collision between an Air Canada commercial jet and a truck that killed two pilots.
A rare Russian daytime drone attack on Ukraine killed three people, wounded several dozen and set a building in the historic centre of the western city of Lviv aflame on Tuesday, officials said, following an overnight bombardment that killed five.
A total of 69 people died when a Colombian military plane crashed soon after takeoff earlier this week, the country's armed forces said in a statement on Tuesday, in an incident that injured 57 others.
The Ministry of Defense (MoD) have offered their condolences to the family of a Moroccan civilian contractor in the UAE Armed Forces who was killed during a routine mission in Bahrain following an Iranian missile attack.
There is no direct Qatari mediation between the United States and Iran, but Doha supports all formal and informal diplomatic channels to end the war, Qatar's foreign ministry spokesperson said on Tuesday.
Germany and France have both spoken out against United States President Donald Trump's actions over the conflict in Iran in a rare rebuke of a major ally.
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