The Wall Street Journal reports:
The U.S. believes Russia is firing artillery across its border at Ukrainian military positions, the State Department said on Thursday, an assertion that Moscow is playing a more direct role in the Ukrainian conflict. The latest accusations show U.S. officials raising pressure on Moscow and more closely examining Russian activities near the rebel-held portions of eastern Ukraine since the downing of Malaysia Airlines Flight 17, which Washington blames on pro-Russian separatist fighters. State Department spokeswoman Marie Harf also said the U.S. has evidence that Russia intends to deliver powerful rocket systems to the pro-Russia fighters in Ukraine, but declined to provide details about the systems or about how officials came to that conclusion.