BBC: Ukraine's Poroshenko warns of 'full-scale' Russia invasion
President Petro Poroshenko has told MPs the military must prepare to defend against a possible "full-scale invasion" from Russia, amid a surge of violence in eastern Ukraine.
Russia has denied that its military is involved in Ukraine, but Mr Poroshenko said 9,000 of its troops were deployed.
Clashes involving tanks took place in two areas west of Donetsk on Wednesday.
There was a "colossal threat" that large-scale fighting would resume, the president told parliament in Kiev.
The outbreak of violence, in the government-held towns of Maryinka and Krasnohorivka, was among the worst in eastern Ukraine since a ceasefire was signed in Minsk in February.
WNU Editor: There are 50,000 Ukrainian soldiers in eastern Ukraine, and apparently they are now on the move .... VOA Witnesses Troop Movements in E. Ukraine (VOA). If true .... expect the war to resume in the next few days (if not sooner).
Ukraine War News Updates -- June 4, 2015
Ukraine's Poroshenko warns of Russian invasion threat after fighting surge -- Reuters
Ukraine's Poroshenko warns of 'colossal threat' of new clashes -- AFP
Ukraine's Poroshenko: ‘Colossal threat’ of heavy fighting looms -- Al Jazeera
Ukraine president Petro Poroshenko warns military to be prepared for 'full-scale invasion' by Russia -- ABC News (Australia)
Eastern Ukraine tense after outbreak of fighting -- AP
Full-scale Russian invasion real threat to Ukraine: Poroshenk -- Ukraine Today
Escalation of fighting in east Ukraine leaves ceasefire teetering on the brink -- The Guardian
Observers Say Rebels in Eastern Ukraine Moved Heavy Weapons Before Fighting -- WSJ
New Ukraine fighting a 'colossal threat' as 24 killed -- 9News
Ukraine: 24 Die In Worst Clashes Since Truce -- SKY News
East Ukraine: Five Servicemen Killed in Worst Violence in Months -- NBC
About 80 militants killed, more than 100 wounded near Maryinka, Ukraine's military says -- Ukraine Today
Ukraine pushes back largest Russian attack in months as 1,000 ‘pro-Moscow rebels’ supported by tanks lay siege to government-held town -- Daily Mail
Ukraine: Pro-Russian Artillery Barrage Shatters Cease-Fire -- Newsweek
Ukraine, Russia trade barbs amid signs of new offensive -- USA Today
Kremlin: Timing of Kiev-provoked Donbass tensions linked with looming EU summit -- RT
Ukraine's unrecognized republic official concerned by Poroshenko’s rhetoric -- ITAR-TASS
West Concerned Over Escalation Of Ukraine Violence, Warns Russia -- Radio Free Europe
EU fears Ukraine violence 'spiral', warns on sanctions -- Reuters
Germany says fighting in eastern Ukraine "worrying" -- Reuters
France says violence in eastern Ukraine must stop -- Reuters
NATO Chief: Ukraine Truce 'Very Fragile' -- AFP
There's 'a major, multi-front escalation' happening in Ukraine -- Jeremy Bender, Business Insider
Ukraine's War Is Back -- Mark Champion, Bloomberg
West Can't Wait Out Putin on Ukraine -- Leonid Bershidsky, Bloomberg
War flares in Ukraine. Who's lighting the fuse? -- Fred Weir, CSM
Western Defeat in Ukraine -- Roger Cohen, NYT
Ukraine's surge in violence raises stakes for Poroshenko -- Tom Burridge, BBC