Sounds like we’re in agreement that Russia broke the ceasefire by invading.
As for the stationing of troops and equipment, it’s well documented they were sending shipments of equipment in weekly.
In regards to Ukraine arming themselves, no shit, they had just been invaded. There was nothing in the Minsk agreement that said Ukraine couldn’t defend itself from future invasions. Russia was party to the Minsk agreements, and required to remove their forces and military equipment, but did the opposite, sending more. Germany was not forbidden by the agreements to assist Ukraine.