Ukrainian Government Storming Pro-Russian Rebel Strongholds: Report

Escalation? This source reports so:

#BREAKING: Gunfire, heavy detonations heard near Ukraine town of Slavyansk

— Agence France-Presse (@AFP) May 2, 2014

As well as:

Trusted source: UKR apc's + 40 troops 6km south #sloviansk Civilian gathering around APC's #ukraine

— Pierre Crom (@PierreCrom) May 2, 2014

Also, a pic of pro-Russian rebels hiding behind sandbags: