Sikorski met Zelenskyy in Kyiv on Friday on the sidelines of a conference.

Following the meeting, Poland's Ministry of Foreign Affairs posted on X: “They discussed the situation on the front, Poland’s support, Ukraine’s path to the EU, and bilateral relations.”

The post added: “FM raised the issue of exhuming the Volhynia massacre victims and their burial.”

The source told TVP World that it was for this reason that “the atmosphere at the talks in Kyiv was chilly.”

The Volhynia Massacre was an act of genocide by Ukrainian nationalists during WWII on Polish residents of the region now located in western Ukraine.

The issue remains a bone of contention between Warsaw and Kyiv, as Ukraine refuses to allow the exhumation of the victims while using its instigators and perpetrators as national icons meant to inspire its soldiers in the fight against the Russian invaders.

The Polish source told TVP World that Sikorski attempted to persuade Zelenskyy to agree to “the exhumation of the victims and their proper burial, to get the problem out of the way and not have to return to the matter, which is very important for Poles.”

According to the source, this “single request was not accepted by the Ukrainian side, which in turn issued a list of demands it expected Poland to meet.”