Turkish President Recep Tayyip Erdogan gestures during a meeting. File photo

Turkish President Recep Tayyip Erdogan spoke to Ukraine’s Volodymyr Zelensky by telephone, discussing the situation in Ukraine and negotiations between Moscow and Kyiv, Erdogan’s office said late Friday.

Erdogan told his counterpart that he had raised Turkey’s support for Ukrainian territorial integrity at a recent NATO summit, where he had relayed the diplomatic efforts made by Turkey in one-one-one meetings with other leaders, according to a statement from the Turkish presidency.

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Earlier, Erdogan says Ukraine and Russia appear to be making progress on four issues being negotiated for an end of the fighting but differences remain on two other key issues.

Ukrainian President Volodymyr Zelensky speaks in Kyiv. File photo

Even as the conflict rages, a vast apparatus are being built to gather and preserve evidence of potential war crimes.

Less than a month after Putin’s order to drop the first bombs on his neighbor, the United States declared that Russian forces were violating international laws of war that were written after World War II. But it remains far from clear who will be held accountable and how.

Possible war crimes that have been reported in Ukraine include destroying homes, firing on civilians as they evacuate through safe corridors, targeting hospitals, using indiscriminate weapons like cluster bombs in civilian areas, attacking nuclear power plants and intentionally blocking access to humanitarian aid or food and water.

But intention matters. Destroying a hospital alone is not evidence of a war crime. Prosecutors would have to show that the attack was intentional or at least reckless.