Moscow expels two Irish diplomats in retaliation for expulsion of four Russians

Airspace bordering Russia monitored from air operations centre in Germany

Deputy prime minister says Russian forces have not fully opened a route for evacuation of civilians to Ukraine-held territory

Calls from Kyiv for intervention rebuffed but West vows more aid for Ukrainian resistance

Alliance warns of ‘severe consequences’ if Russia uses chemical or biological weapons

Biden to join leaders at Nato, G7, EU summits a month into Russia’s invasion of Ukraine

Tens of thousands of people still hiding in basements in besieged Mariupol

Nato secretary general Stoltenberg warns Russia against using nuclear, biological or chemical weapons in Ukraine

Ukrainian president calls on country to match words with more decisive deeds

Russia’s campaign beset by strategic errors, logistical shortcomings and intelligence blunders

22,000 additional Nato troops and their military equipment have been moved into eastern Europe

Standing ovation at extraordinary European Parliament session but West rules out no-fly zone

Ukrainian delegate says ceasefire talks with Russian side on Monday were difficult

Nato chief warns ‘the Kremlin’s objectives are not limited to Ukraine’

Forces not being sent to Ukraine to avoid ‘existential’ war with Russia, say UK ministers

Invasion of Ukraine poses ‘serious threats’ to Euro-Atlantic security, says Nato chief

Kyiv ‘used by third countries to create threats towards Russia’, Putin says

Self-proclaimed Donetsk and Luhansk people’s republics declared independence from Kyiv in April 2014

EU leaders criticise ‘blatant violation of international law’ following Putin move

Russian president observes missile drills with Belrusian leader Lukashenko

Biden says his ‘sense’ is that Russia will invade Ukraine within several days

Many in Kyiv are sceptical about dire western predictions of a Russian onslaught

Alliance chief says Russia is continuing its military build-up near Ukraine border

Russia releases video showing military vehicles leaving Crimea

European Commission sets out proposals to encourage greater EU co-operation on defence

Western leaders discuss Ukraine crisis as Biden warns ‘things could go crazy quickly’

Macron says Putin pledged not to escalate tension but Kremlin denies deal on military moves

Moscow decries western ‘hysteria’ and US and UK threats to sanction Russian elite

Nato ‘prepared for the worst’ as Kremlin warns of ‘military-technical’ response

US president says western governments preparing to impose ‘massive consequences’ on Kremlin

Concerns that Russian naval drills off Ireland could impact on communications cables

Bombardment of briefings and intelligence threats marks novel approach to avoiding war

President seeks to clarify earlier remarks about ‘minor incursions’

Kremlin says European security at ‘critical point’ as West rejects its Nato and Ukraine demands

Stoltenberg calls for Russia co-operation as week of intense diplomacy on Ukraine crisis begins

Russian and US diplomats to begin talks on the conflict on Monday, without the EU

Proposals would rewrite many of the principles behind European security in recent decades

Ukrainian president says Russian aggression is pushing his country towards Nato

Tensions rise at border as guards use water cannons against restive crowds

EU defence and security officials critical of US decision to send home its 2,500 troops