|A 2S19 Msta, a 152mm howitzer with a maximum firing range of 29-36 kilometers|
From The Interpreter (Day 183 LiveBlog):
This weapon was reportedly photographed near Kamensk-Shakhtinsky, headed toward Russian Donetsk (map), the location of the Izvarino border crossing. The separatists have never acquired this weapon, to our knowledge, so if this shows up in Ukraine it will be a clear indication that Russia sent it there. It will also be a significantly dangerous addition to the separatist arsenal.
Also, something else of note that has been noticed with regards to how Russia operates:
The pattern has always been that Russia escalates its interference in Ukraine at the same time that it elevates its diplomatic overtures. If the leaders of Russia and Ukraine are scheduled to meet on August 26th, it is likely going to be a very dangerous 7 days.