February 2015 Kramatorsk rocket attack

The OSCE Special Monitoring Mission to Ukraine was an international civilian observer mission of the Organization for Security and Cooperation in Europe (OSCE) mandated to contribute to reducing tensions and to help foster peace in Ukraine. The mission was deployed in March 2014, following the Russian annexation of Crimea and the outbreak of open conflict in eastern Ukraine. Following the 2022 Russian Invasion of Ukraine, the mission discontinued its operations on 31 March 2022.

The Organization for Security and Co-operation in Europe (OSCE) is the world's largest regional security-oriented intergovernmental organization with observer status at the United Nations. Its mandate includes issues such as arms control, promotion of human rights, freedom of the press, and free and fair elections. It employs around 3,460 people, mostly in its field operations but also in its secretariat in Vienna, Austria, and its institutions.

Kramatorsk Airport, also known as Kramatorsk military airfield, is a military airfield in Donetsk Oblast of Ukraine. The airbase is 3.4 km SSE from the centre of Kramatorsk and at about 20 km south of Slovyansk.

An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft without any human pilot, crew, or passengers on board. UAVs were originally developed through the twentieth century for military missions too "dull, dirty or dangerous" for humans, and by the twenty-first, they had become essential assets to most militaries. As control technologies improved and costs fell, their use expanded to many non-military applications. These include aerial photography, precision agriculture, forest fire monitoring, river monitoring, environmental monitoring, policing and surveillance, infrastructure inspections, smuggling, product deliveries, entertainment, and drone racing.

The Orlan-10 is a reconnaissance, unmanned aerial vehicle (UAV) developed by the Special Technology Center (STC) in Saint Petersburg for the Russian Armed Forces. The Orlan-10 features a composite hull that reduces its radar signature.

The Buk is a family of self-propelled, medium-range surface-to-air missile systems developed by the Soviet Union and its successor state, the Russian Federation, and designed to counter cruise missiles, smart bombs, fixed- and rotary-wing aircraft, and unmanned aerial vehicles.