The US believes Russia intends to provide heavier and more sophisticated weapon systems to the separatists in Ukraine in the near future.
Pentagon spokesperson Colonel Steve Warren said the US "has indications" Russia intends to supply the separatists with large calibre multiple launch rocket systems. Colonel Warren said this could happen "at any time".
He stressed the US has seen a continuous flow of weapons and equipment from Russia into Ukraine for several weeks.
Asked about the reports yesterday that Russia has been targeting Ukrainian military sites inside Ukraine from across the border in Russia, Colonel Warren said this is "unquestionably an escalation from a military perspective".
And while he would not provide a battle damage assessment or talk about Russian targeting, Colonel Warren said these artillery strikes do cause "great concern" about the possibility of civilian casualties.
The mother of the three Australian children killed on flight MH17 told a memorial service her "arms would always be reaching for them."
A woman has apparently posted pictures of herself on social media with mascara looted from the Malaysian Airlines flight MH17 crash site.
A large section of plane wreckage and everyday carry-on items like chocolates remain scattered among the wild flowers at the crash site.