Washington, Jumada I 2, 1436, Feb 21, 2015, SPA -- The United States Friday warned Russia that its efforts to bolster separatist violence in Ukraine despite a ceasefire agreement were a direct threat to the "modern global order" and could bring additional costs. "Russia's continued support of ongoing separatist attacks in violation of the ceasefire in eastern Ukraine is undermining international diplomacy and multilateral institutions - the foundations of our modern global order," State Department spokeswoman Jen Psaki told reporters. "We call upon Russia to honor its commitments immediately with decisive action before we see more cities decimated and more lives lost in eastern Ukraine. We remain focused on supporting the implementation of these agreements, but we are watching closely. And if Russia and the separatists fail to implement the agreement, end the violence ... there will be additional costs," Psaki said. --SPA 12:21 LOCAL TIME 09:21 GMT www.spa.gov.sa/w