1/4 Comms with military observers in Donetsk region lost.Team not OSCE monitors but sent by States under Vienna Doc on military transparency

7:35 PM – 25 Apr 2014

2/4 All members of the OSCE Special Monitoring Mission and OSCE/ODIHR election observers are safe and accounted for

7:36 PM – 25 Apr 2014

3/4 Military verification team – led by Germans – and composed of 8 members – 4 Germans, 1 Czech, 1 Danish, 1 Polish, 1 Swedish

7:36 PM – 25 Apr 2014

4/4 Military verification team sent following invitation from Ukraine under terms of Vienna Document 2011

7:37 PM – 25 Apr 2014

Source: OSCE.org

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The Vienna Document is an agreement between the participating states of the Organization for Security and Co-operation in Europe implementing confidence and security building measures.
Its provisions include an annual exchange of military information about forces located in Europe (defined as the Atlantic to the Urals), notifications for risk reduction including consultation about unusual military activities and hazardous incidents, prior notification of certain military activities, observation of certain military activities, exchange of annual calendars, and compliance and verification by inspection and evaluation visits.
This exchange differs from the Global Exchange of Military Information in that it is limited to forces in Europe, while the Global Exchange of Military Information applies to all forces of the participating states, wherever located.
The annual exchange of information is conducted concurrently with the annual exchange of information under the Conventional Forces in Europe treaty, in Vienna, Austria in December of each year. The Vienna Document has been revised periodically, and the current version is the 2011 version.
 From Wikipedia

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Overview of Vienna Document 2011

Vienna Document 2011 (VD11) is composed of politically binding confidence and security-building measures (CSBMs) designed to increase openness and transparency concerning military activities conducted inside the OSCE’s zone of application (ZOA), which includes the territory, surrounding sea areas, and air space of all European (Russia from the western border to the Ural Mountains) and Central Asian participating States. A variety of information exchanges, on-site inspections, evaluation visits, observation visits, and other military-to-military contacts take place according to VD11 provisions. In the case of the United States (and Canada), only military forces and activities inside the ZOA are impacted.

VD11 builds on previous agreements: the 1975 Helsinki Final Act, the Document of the Stockholm Conference of 1986, the 1992 Helsinki Document, and the Vienna Documents of 1990, 1992, 1994, and 1999. It is part of an interlocking web of mutually enforcing agreements, including the Treaties on Conventional Arms Control in Europe (CFE) and Open Skies, which form the current European conventional arms control framework.