Russia, which invaded Ukraine on February 24, refused to join the ICC when the court was set up in 2002 to try people for offences including war crimes, crimes against humanity and genocide."Certainly if there was a need... and there was a reason why those trials could not take place in Ukraine, whether it's because of some legal additional provisions that we have or not, I am sure that we would get the cooperation from Ukraine," he added.The ICC opened its own probe into the war in Ukraine shortly after Russia invaded, but has said it is keen for Ukraine to bring suspects to justice where possible."All of the hits of every missile, every drone, every damage of civil infrastructure, every Ukrainian who was killed or wounded by these missile attacks, all of them are documented and criminal proceedings were opened," he said.Ukraine's allies have pledged more powerful air defence systems after days of devastating Russian attacks that President Vladimir Putin said were retaliation for a deadly explosion at a Crimean bridge."