KYIV, June 16 (Reuters) - French President Emmanuel Macron, German Chancellor Olaf Scholz and Italian Prime Minister Mario Draghi arrived in Kiyv on Thursday on a joint trip to show their backing for Ukraine as it struggles to withstand a Russian assault.

BFM TV showed live footage of the overnight train arriving in the Ukrainian capital.

The visit has taken weeks to organise with the three men looking to overcome criticism within Ukraine over their response to the war.

"It's an important moment. It's a message of unity we're sending to the Ukrainians," Macron said as he arrived in Kyiv.

Asked why the visit was taking place now, an Elysee official said they had considered it was best to do it just before an EU summit next week that is due to discuss Kiyv's bid to join the 27-naton bloc.

The European Commission is due to make on Friday a recommendation on Ukraine's status as an EU candidate, something the biggest European nations have been lukewarm about.

"The useful time for this visit was the European Council of 23/24, where a strong symbolic gesture is expected by the Ukrainians," the Elysee official said.

"A balance has to be found between Ukraine's natural aspirations to (join) the EU at a very special time, and attention to all the countries which already have candidate status and are stuck in the negotiation chapters and the fact that we must not destabilise the EU or fracture it".

Kyiv has accused France, Germany and, to a lesser extent, Italy, of foot-dragging in their support for Ukraine, saying they have been slow to deliver weapons and of putting their own prosperity ahead of Ukraine's freedom and security.

Zelenskiy is expected to push his visitors to send more arms to help his hard-pressed army withstand the Russian invaders.