Ukrainian Independent Information Agency

A Reuters journalist, covering the war in Ukraine, was reported missing following a missile strike on his hotel in the eastern city of Kramatorsk. The city, under Ukrainian control but close to the front lines, saw the Sapphire Hotel destroyed by what is believed to be an "Iskander" missile on Saturday night.

One of the leading news from Ukrainian media today is that Bulgaria will provide massive military aid to Kyiv against the Russian invaders.

Here are the highlights of events related to the war in Ukraine over the past 24 hours:

Explosions in the center of Kyiv. Fighter jets fly over the city

World media reported explosions in the center of Kyiv, a day after the Russian president accused Ukraine of a terrorist attack on the Crimean bridge.

The frigate "Admiral Makarov" - one of the newest in the Russian Black Sea Fleet - was hit by Ukrainians near the notorious Snake Island, Ukrainian media reported.

So far, neither army has confirmed or denied the news.

It was reported by the Odessa edition of "Dumskaya" yesterday and spread instantly in the Ukrainian media.

Russia is attacking Ukraine - its troops have crossed our northern borders, journalist Yuriy Butusov was quoted as saying by the Ukrainian news agency UNIAN.

"Military sites across the country have been attacked, primarily parts of the (Ukrainian) air defense and control systems," he wrote.

"Ukraine's armed forces are resisting," Butusov added.

Tens of thousands of people have been evacuated after massive explosions and a blaze at a military ammunition depot in central Ukraine.

Ukranian emergency services said the blasts occurred at a military base near Kalynivka in the Vynnytsya region, 270km (168 miles) west of Kiev.

One person was injured, it said.

Ukraine has filed a "special partnership" request with NATO, state news agency UNIAN has said.

The document was sent in an official letter from Ukrainian President Petro Poroshenko, before a Ukraine-NATO Commission meating in Brussels.

The idea is to become part of the program of enhanced opportunities for special partners of NATO.

Ukrainian President Petro Poroshenko says he is to call a permanent ceasefire following a conversation with his Russian counterpart Vladimir Putin.

Poroshenko's press office says the conversation the two held over the phone has led to "an agreement on a permanent ceasefire in the Donbass region" in the east of Ukraine.

Kiev forces have pulled back from the airport of Luhansk in eastern Ukraine after having fought pro-Russian separatist for hours.

The country's security council confirmed the move in a statement quoted by UNIAN news agency.

Meanwhile reports emerged that a Ukrainian warship had been attacked by separatists in the Azov sea. Kiev says the cutter was assaulted from the coast.

Ukrainian military officials say a convoy carrying refugees from Eastern Ukraine has been hit in the Luhansk area.

Information of the assault, allegedly carried out by pro-Russian rebels, has not yet been verified.

A spokesman of the self-proclaimed "Donetsk People's Republic" was quoted by ITAR-TASS as saying he did not know of such incident.