Japanese Foreign Minister Hayashi Yoshimasa says Japan will support Ukraine's reconstruction by using accumulated experience and knowledge following the devastation from World War Two and natural disasters.

Hayashi delivered a speech at the Ukraine Recovery Conference in Britain on Wednesday.

Hayashi expressed his strong concern about the enormous impact from a dam collapse in southern Ukraine, and said Japan will provide additional assistance through an international organization and other bodies.

The newly announced support includes about 160 water purifiers, about 530 generators, 30 construction machines and other equipment.

Hayashi noted Japan had rebuilt itself after World War Two and has recovered from natural disasters such as the 2011 earthquake and tsunami.

He stressed that Japan will apply its cumulative experience and knowledge, and "vigorously implement uniquely Japanese form of reconstruction assistance in close contact with the Ukrainian people."

The minister explained that Japan's assistance will be offered mainly in the areas of mine removal and debris clearance, rebuilding of livelihoods including basic infrastructure, recovery of agricultural production and industrial development.

Hayashi also said a Japan-Ukraine conference for promotion of economic reconstruction will be held sometime between the end of this year and the beginning of next year, so that Japan's public and private sectors can strongly support Ukraine's recovery.

The minister added Japan will continue working closely with the international community to bring about long-lasting peace in Ukraine as soon as possible.

He concluded his speech by saying Japan always stands with Ukraine.