Four years of war in Ukraine has brought seismic evolution to the world - to the nature of warfare, the balance of global powers, and to European security.

Iran agreed a secret €500mn arms deal with Russia to acquire thousands of advanced shoulder-fired missiles in its most significant effort to rebuild air defences shattered during last year’s war with Israel.

In the war's first year, Ukraine forced back the Russian offensive at the gates of Kyiv and reclaimed swathes of occupied land. But a Ukrainian counteroffensive failed the following year, and since then Moscow has made slow but relentless gains in costly battles along a 1,200-km (750-mile) front.

The European Union failed to pass new sanctions on Russia on Monday after surprise objections from Hungary, the bloc's top diplomat said. “This is a setback and a message we did not want to send today,

Serhii Kyslytsia is among those trying to negotiate an end to the conflict, which is entering its fifth year.

Iran agreed a secret €500mn arms deal with Russia to acquire thousands of advanced shoulder-fired missiles in its most significant effort to rebuild air defences shattered during last year’s war with Israel.

Ukrainian forces struck an industrial site deep inside Russia on Saturday, which Ukraine and unofficial Russian news channels say was a key state-owned missile factory.

Ukraine forces have struck what is said to be a major missile factory deep inside Russia, as Moscow keeps up heavy drone attacks on Ukraine.

Ukraine talks, but there's little hope of a breakthrough to end the deadliest war on European soil in 80 years.

About half of the country’s federal budget goes toward the fight in Ukraine, money that does little to support its long-term development.