India, June 26 -- Russia is moving a significant part of its air defences to protect a handful of prime targets, including Moscow, as Ukraine's long-range drones continue to hammer sites deep inside the country, Ukrainian President Volodymyr Zelenskyy says.

Ukraine has in recent months stepped up its aerial campaign against Russian military installations and energy facilities. Its success has caused fuel shortages and disrupted army supply lines, stalling Moscow's invasion of its neighbour after more than four years of fighting and rattling Russian officials.

Zelenskyy said in his daily video address late Wednesday that Russia is moving more air defences to the capital as well as to Valdai, a town some 500 kilometres northwest of Moscow...