There was a forum discussion a few months ago: https://community.ricksteves.com/travel-forum/poland/western-ukraine-travel
For best information try the American State Department:
Ukraine Travel Warning LAST UPDATED: JANUARY 5, 2015 The Department of
State warns U.S. citizens of the risks of travel to eastern Ukraine.
Despite the signing of a ceasefire agreement in September 2014,
violent clashes between Russia-backed separatists and Ukrainian forces
continue in parts of the eastern regions of Donetsk and Luhansk,
resulting in thousands of injuries and deaths. In addition, Russian
military forces continue to occupy the Crimean Peninsula and are
present on the eastern border of Ukraine. This supersedes the Travel
Warning for Ukraine dated August 29 to provide updated information on
the security situation in southern and eastern Ukraine.
U.S. citizens are urged to follow the guidance in the Travel Warning
for Ukraine and defer all travel to the Crimean Peninsula at this
time. In March 2014, Russia occupied the Crimean Peninsula, which
remains part of Ukraine notwithstanding Russia’s illegal military
Violence against foreigners in Ukraine is rare but you should avoid
large gatherings or protests and adjacent areas. During the past year,
large-scale protests have occurred in many cities throughout Ukraine.
While mostly peaceful, some of these protests have turned violent and
resulted in deaths and injuries. Even demonstrations that are meant to
be peaceful can become violent and unpredictable. Be alert and aware
of your surroundings and pay attention to what the local news media
report. If the Embassy obtains information about a planned protest
ahead of time, an announcement will be posted on the Embassy website.