|World powers urged Russia and Ukraine to refrain from ratcheting up a confrontation over Crimea as President Vladimir Putin bolstered military assets with his army’s most advanced air-defence missile systems.|
The European Union said there was no independent confirmation of claims that Ukrainian agents had killed two Russian servicemen in Crimea. Putin pledged a “very serious” response as he blamed Kiev for pursuing “terror” activities. The 28-member bloc called on both sides to refrain from intensifying what has led to the worst diplomatic standoff between the two countries since a 2015 truce. The S-400 Triumf is an anti-aircraft weapon system developed by Russia's Almaz Central Design Bureau in the 1990s as an upgrade of the S-300 family.
| It has been in service with the Russian Armed Forces since 2007.|
The S-400 uses three different missiles to cover its performance envelope. These are the extremely long range 40N6, long range 48N6 and medium range 9M96 missile.
|Triumf air defence missile systems are capable of destroying incoming hostile aircraft, missiles and drones with a range of 400 km.|
|Ukrainian tanks and APCs move towards the de-facto border with Crimea near Kherson, southern Ukraine, Friday, Aug. 12, 2016.||Pro-Russian separatists attacked Ukrainian forces near separatist-held cites of Donetsk and Luhansk and the government-controlled Black Sea port of Mariupol, Ukraine’s military said. One Ukrainian soldier was killed and four were injured, according to a spokesman|
The U.S., the EU and their allies have refused to recognize Russia’s takeover of Crimea. NATO said it was closely monitoring the heightened tensions.