Ukrainian President Petro Poroshenko has called on the international community to elaborate tools to officially document evidence of aggression of one states against others, and asked that responsibility for such activity be introduced in keeping with UN Charter principles.

"I believe it is time for our Organization to work out serious safeguards against abuses of trust of the world community by some UN member states. It is necessary to elaborate mechanisms how to officially document evidence of the aggression of one country against another and to envisage clear responsibility for the aggressor in line with the UN Charter principles," he said at the 71st session of the UN General Assembly in New York on Wednesday.

"The terrorist component of the undeclared hybrid war that Russia wages against Ukraine is evident. Dramatically, it has become a daily routine in the occupied areas of the Donetsk and Luhansk regions of Ukraine," he said.

In his words, for over two years of this tragedy, Ukraine has received extensive and irrefutable evidence of direct involvement of Russia, its state agencies and officials in financing, sponsorship, and coordination of terrorist groups which have committed countless crimes against my compatriots.

"Today, in response to thousands of available photos, videos, satellite images, eyewitness and other evidence of the Russian military presence in Donbas, Russia repeats over and over again cynically, 'We are not there,'" he said.

According to Poroshenko, Russia used to say the same about Crimea. "We are not there." "And then a sham referendum was conducted at the Russian gunpoint. And a few days ago, a contradictory statement was made by the Russian president that Crimea, can you imagine, was annexed 'in accordance with the UN Charter.'"

"Do we really refer to the same Charter? This is not merely disrespect for centuries-long principles of international relations, written and unwritten legal and ethical rules. This is the downgrading of diplomacy as such," he said.