BRUSSELS (Reuters) - NATO and the West must act quickly to prevent an escalation of violence between Ukraine and Russia, Ukrainian Foreign Minister Dmytro Kuleba said on Tuesday, saying further sanctions against Moscow and more military help to Kyiv could help. “At the operational level, we need measures which will deter Russia and which will contain its aggressive intentions. This could be ... a new round of sanctions which would raise the price of Russian aggression,” Kuleba told a news conference at NATO alongside NATO Secretary-General Jens Stoltenberg. “This could be direct support aimed at strengthening Ukraine’s defence capabilities. Because we do know that Russia spares no effort to prevent third countries from cooperating with Ukraine in the defence sector. Russia is working hard to undermine our defence capabilities.”