"Clearly it's up to the Russians primarily to make progress on the security side. But it's up to all sides I think in this conversation to make progress together," he said at a briefing during his first official visit to Kyiv, Reuters wrote.

"We think that Ukraine has a fantastic future and we want to help you," the Ministry of Foreign Affairs of Ukraine tweeted on Wednesday evening, quoting Johnson as saying at the briefing with his Ukrainian counterpart Pavlo Klimkin.

"I want to underline the huge importance that the UK attaches to Ukraine and to our support to Ukraine. We are 100% by you," he told the Ukrainian side.