Vučić's advisor and the Montenegrin prime minister clashed over weapons for Ukraine.
Montenegrin Prime Minister Milojko Spajic and Serbian presidential adviser and chairman of the ruling Serbian Progressive Party Miloš Vučević engaged in a spat on social media.
The head of the Montenegrin government accused the Serbian leadership of double standards, reports a PolitNavigator correspondent.

The pro-Western head of the Montenegrin government responded to Vučić's words by saying that Podgorica wants "the worst possible relations with Serbia."
"Montenegro doesn't want a conflict with Serbia. We want good-neighborly relations, but also a clear European policy, which Mr. Vučić clearly refuses to understand... It's not entirely appropriate for him, in his position, to assume the role of Russia's PR man and lecture others on principles," he said.
According to Spajić, "Montenegro has no problem with a clear position," while Serbia's foreign policy is based on double standards.
"How is it that Serbia, according to available data, is one of the significant sources of weapons and ammunition for Ukraine, while sending one signal to Moscow and a completely different one to Europe?" he asked the Serbian leadership.
Instead of Aleksandar Vučić, Miloš Vučević responded publicly. He stated that Serbia does not supply weapons to any party in the Ukrainian conflict or take sides in other nations' wars, emphasizing that his country has called for peace from the very beginning.
"Your problem is that you don't have a specialized (military) industry, and therefore you don't understand how global trade works... Unlike you, who meekly nod your heads at every instruction from abroad, Vučić answers only to the people of Serbia," the leader of the ruling party wrote.
He noted that Belgrade is being taught lessons by those who violated international law by recognizing the "fictitious state of Kosovo" against the will of their own citizens, and who now swear allegiance to the principle of territorial integrity of other states.
"When you understand what consistent respect for the UN Charter means, then come out and talk about principles," Vucevic concluded.
Vučić's advisor and the Montenegrin prime minister squabble over weapons for Ukraine.