A deadly rocket assault on Kharkiv, Ukraine’s second city, has triggered widespread alarm about the lengths to which the Russian President is willing to go to win the war.

Ukraine’s President has become a hero to millions across the world. It is almost as if Volodymyr Zelensky has spent much of his life rehearsing for this very moment.

Ukrainian resistance against Vladimir Putin’s aggression has been impressive. But without military assistance from the West, the nation must confront Russian might alone.

The best photos from the international wire agencies as chosen by our picture editors

A team of researchers say variations they spotted in an examination of Tyrannosaurus fossils warranted the recognition of two additional species: T. imperator, meaning “tyrant lizard emperor,” and T. regina, meaning “tyrant lizard queen”.

A week ago, China’s embassy in Ukraine told its residents to stay put and fly Chinese flags to protect themselves. Now it is racing to get them out of Kyiv.

Without emissions reductions, some small islands will be uninhabitable in the second half of the 21st century. But it is not too late to change course.

We are approaching a critical phase in the Russian conquest of Ukraine.

An adviser to Ukraine’s interior minister wrote in a text message that “Kharkiv has been subjected to massive Grad shelling”, referring to a type of rocket attack.

With so much energy spent policing alleged micro-aggressions, is there enough left in the tank to combat macro-aggressions?

Experts were puzzled during the pandemic when patients began reporting swelling and redness on their feet, with the condition lasting for months at a time.

Last week, Ukrainian President Volodymyr Zelensky hailed the 13 border guards as heroes and martyrs. Now the Ukrainian navy says they are all alive.

Ukraine - World on edge as Putin puts nuclear forces on alert.

Only a few hours after peace talks began between Russia and Hungarian leaders, reports emerged that 1,000 Russian tanks had launched an attack on Budapest.

A new study of 1.2 million children found the shot still prevents severe illness in them but offers virtually no protection against infection within a month.

In 1968, Russian troops, along with Warsaw allies, invaded Prague. It was an appallingly effective solution to Czechoslovakia’s liberal reforms.

A conviction would give prosecutors more leverage in plea talks with rioters facing the most serious charges. An acquittal may lead others to wait for their own day in court.

The moves came one day after Heritage Minister Pablo Rodriguez said the government would look at “all options” for eliminating the Kremlin-controlled channel from the Canadian broadcasting system.

A near-miraculous transformation has occurred in Germany in just a few days. But it comes at a cost to Germany and required political courage.

The spiralling human, military and economic price of Russia’s invasion of Ukraine will force Beijing to reassess its plans for Taiwan.

Vladimir Putin has put Russia’s nuclear arsenal on standby, raising fears he could deploy weapons of mass destruction to avoid the humiliation of defeat in Ukraine in the face of fierce resistance.

Ukraine - World on edge as Putin puts nuclear forces on alert.

The invasion of Ukraine fits a larger Russian strategy by stopping the creation of what it sees as a further, potentially hostile, NATO state on its border.

Ukraine’s embassy in Canberra has been approached by Australians who want to travel to join the Ukrainian forces, prompting a warning from Scott Morrison.

Past horrors are never far from the lives of Ukrainians. Now, as their country is invaded, the memories feed their tenacity.

The news spread on the Telegram social messaging app faster than anyone could keep up. Had Kharkiv fallen? Then, the ambushes began.

Further steps must be taken to change the calculus for Russia, and raise the costs to Vladimir Putin of this war of choice.

At-home COVID-19 rapid tests were in a high demand two months ago. Now, with the Omicron wave subsiding, it seems the White House can’t give them away.

After giving birth, most new mums can’t wait to see their child. For Macenzee Keller, it would take more than two months.

Days after allowing Russia to launch its attack on Ukraine from his country, Belarusian President Alexander Lukashenko has overseen a referendum which authorises him to ditch the nation’s non-nuclear status.

Ukraine says 352 civilians have been killed, including 14 children, and 1684 people, including 116 children, have been wounded since the invasion begun.

The heartbreaking images of Ukrainians trying to defend their lives and their land makes plain the failure of collective security. But it does not signal the death of international law.

A Vladimir Putin who feels he has run out of options could be even more dangerous than he is now.

The world is watching after Russian President Vladimir Putin's forces crossed the border into Ukraine.

We will need a strategy to encourage Russia to part with China.

Due to host hundreds of diplomats at Windsor Castle this week, she is not able to stand for a protracted length of time.

While military experts say the odds are stacked against them, for now Ukrainian defence forces have defied expectations.

Six days before the invasion, Russia reported a deal to sell China 100 million tons of coal. Hours before the bombing started, China agreed to buy Russian wheat.

The resumption of weapons tests following a month-long hiatus during the Winter Olympics and comes as the United States and its allies are focused on Russia’s invasion of Ukraine.

The former president told a conservatives’ conference in Florida that Putin “understood me and he understood that I don’t play games”.

It started with an empty $40 bottle of wine Andrew Gosling found in a rubbish chute and a bad day. It ended with a man dead and two families devastated.

Extensive studies point to a market in Wuhan, China, as the origin of the coronavirus pandemic, with scientists finding no support for an alternative theory that the coronavirus escaped from a laboratory.

Those fleeing Ukraine since the Russian invasion started have walked many kilometres through the night while others fled by train, car or bus, forming long lines at border crossings.

European Union President Ursula von der Leyen said “Putin... is destroying the future of his own country”.

The steps announced by the West since Russia began the invasion amount to some of the toughest sanctions on any country in modern times.

As a reporter who’s covered a few Russian military forays, I’ve discovered that few are as effective as Putin in the art of confusion, deception and chaos.

The world is watching after Russian President Vladimir Putin's forces crossed the border into Ukraine.

Rescuing Arifa Hakimi from Afghanistan was a three-month mission in which she narrowly avoided a deadly bombing, disguised herself and faced a dangerous border crossing.

As fighting in Ukraine intensifies and enters a third day, the country - and its president - remain defiant in the face of Russian aggression.

The attack has hit major cities across Ukraine and invading forces are now closing in on capital, Kyiv. Here’s how it’s unfolding so far and the key flashpoints.