Russia-Ukraine war live: Moscow admits Ukrainian drone reached air base deep inside Russia, three killed

Three Russian military personnel reportedly killed when a drone attacked an airbase near Saratov, 450 miles south-east of Moscow

Russians troops are working “round-the-clock” at new anti-aircraft missile system positions to defend against missile and air strikes by Ukraine, the Russian Interfax reported late on Sunday citing the defence ministry.

Crews of the S-300V systems were “mastering new position areas” of the Russian long range surface-to-air missile systems, the news agency reported.

In the interests of long-range aviation, the development and supply of the entire range of aviation weapons, including new cruise hypersonic missiles, is being carried out.”