Russia could invade Ukraine "at any time" and American citizens should leave immediately, the US has warned.

Russia and Belarus are due to start 10 days of joint military drills as concerns rise over the buildup of Russian forces on Ukraine's borders.

French President Emmanuel Macron has told reporters that President Vladimir Putin assured him that Russian forces would not ramp up the crisis near Ukraine's borders.

French President Emmanuel Macron has said the coming days will be crucial to de-escalating the Ukraine standoff, after a meeting with Russia's Vladimir Putin.

French President Emmanuel Macron has said he thinks a deal to avoid war in Ukraine is possible and that it is legitimate for Russia to raise its own security concerns.

Prime Minister Boris Johnson has been rocked by a string of resignations from his team of aides in Downing Street.

Russia is planning to fabricate a pretext for an invasion of Ukraine, by falsely blaming Ukrainian military for an attack on Russian-backed separatists or Russia itself, US officials say.

Russia's President Vladimir Putin has accused the US of trying to draw his country into a war in Ukraine.

An updated report on lockdown parties in No 10 will be published by Sue Gray once police finish their inquiries, Downing Street has said.

There have been angry clashes between Russian and US envoys at the UN Security Council, after the US called a meeting to discuss Moscow's troop build-up on its borders with Ukraine.