Here is a timeline of recently reported attacks over Ukraine airspace:

:: 29 May - Rebels in eastern Ukraine shoot down a government military helicopter amid heavy fighting around Slovyansk, killing at least 12 soldiers including a general, officials say.

Acting Ukrainian president Oleksandr Turchynov tells parliament in Kiev that rebels used a portable air defence missile to bring down the helicopter. He says 14 died, including General Serhiy Kulchytskiy.

:: 24 June - Ukrainian government says a military helicopter has been shot down over a rebel-controlled area in Slovyansk.

:: 14 July - A Ukrainian military transport plane is shot down along the eastern border with Russia but all eight people aboard managed to bail out safely, the defence ministry says.

Separatist rebels claim responsibility for downing the Antonov-26, but Ukrainian officials swiftly rule that out and blamed Russia instead.

:: 16 July - A Ukrainian air force fighter jet is shot down by a missile fired from a Russian plane, according to Ukraine's Security Council.

The pilot of the Sukhoi-25 jet is forced to bail out after his plane was hit. says spokesman Andrei Lysenko.

Russia's United Nations ambassador, Vitaly Churkin, denies Russian involvement in the incident.

Meanwhile, pro-Russian rebels claim responsibility for strikes on two Sukhoi-25 jets.

:: 17 July - Nearly 300 people are killed when a Malaysia Airlines plane is reportedly shot down over eastern Ukraine.

Flight MH17 from Amsterdam to Kuala Lumpur, was travelling at an altitude of 10,000 metres (33,000ft) when it was brought down by a Buk surface-to-air missile, an adviser to the Ukrainian interior ministry told Russia's Interfax news agency.

Alexander Borodai, the eastern Ukraine separatist leader, said the aircraft was shot down by Ukrainian government forces.