*What is the latest development?*
Russia has deployed its advanced S-400 air defence missile system to annexed Crimea.
Russian press agencies have revealed the news.
*What does it mean?*
The announcement comes two days after President Vladimir Putin promised to take counter-measures after what he said were clashes between Russian forces and Ukrainian saboteurs in northern Crimea.
It comes after the Russian navy staged a large military exercise at the port of Sevastopol in the Black Se…
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