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The T-84 is a Ukrainian main battle tank (MBT), a development of the Soviet T-80 main battle tank introduced in 1976. The T-84 was first built in 1994 and entered service in the Ukrainian Armed Forces in 1999. The T-84 is based on the diesel-engined T-80 version, the T-80UD. Its high-performance opposed-piston engine makes it one of the fastest MBTs in the world, with a power-to-weight ratio of about 26 horsepower per tonne (19 kW/t). The T-84 Oplot is an advanced version incorporating an armoured ammunition compartment in a new turret bustle; ten of these entered Ukrainian service in 2001.
T-84 Oplot-M
BM Oplot guided onto a tank transporter.
BM Oplot at Eurosatory 2012
(Modernized), or "BM Oplot": The newest and most sophisticated version of the T-84 is an upgraded version of the "T-84 Oplot" mounting more advanced armor, new electronic countermeasure systems, and others. One visible feature is the new PNK-6 panoramic tank sight.
https://en.wikipedia.org/wiki/T-84