"They are using medical vehicles to transport ammunition. This is a gross violation of all international conventions,” EuroMaydan was quoted as saying on its Facebook page as the Russian invasion of Ukraine entered its second week.
The post included a video showing Russian ambulances with deadly weapons and ammunition, according to the tvp.info website.
Earlier, the Ukrainian army said that Russian troops were using in Ukraine two particularly devastating types of bombs prohibited by international law, cluster bombs and thermobaric, or "vacuum," bombs, the Polish website reported.
The International Criminal Court has started an investigation into possible war crimes committed in Ukraine, following a request from 39 of the court's member states.
Meanwhile, Poland's Justice Minister Zbigniew Ziobro told reporters in Warsaw this week that he had "ordered Poland's prosecution service to open an investigation into the crime of aggressive war" against Ukraine.
Polish Foreign Minister Zbigniew Rau told the United Nations on Wednesday that Russia's authorities were showing contempt for human rights in their assault on Ukraine and its people.
The UN General Assembly on Wednesday overwhelmingly voted to reprimand Russia for invading Poland's eastern neighbour and demanded that Moscow stop fighting and withdraw its forces from Ukraine, the Reuters news agency reported.
The US ambassador to the United Nations, Linda Thomas-Greenfield, told the assembly that Russia was poised to intensify the brutality of its offensive and urged members to hold Moscow accountable for its violations of international law, Reuters reported.
She cited videos of Russian troops moving heavy weapons into Ukraine, including cluster munitions and vacuum bombs, banned under international law, according to Reuters.
(gs)
Source: tvp.info