Fog of War .... Did Russia invade Ukraine or did it not? Did UK, USA, France, Australia, Canada and half of EU invade Syria or did they not?

It's all to do with the perception of the beholder.  
Are there Russians fighting alongside the separatists? Check.
Is there Russian-made equipment with the separatists?  Check
So, can we say based on the above two factors that Russia has invaded Ukraine? 
If you said: "Yes"  .... then logically speaking you would have to say the same to the second argument, that being:

There are Brits, Americans, French, Australians, Canadians and citizens from half of EU, fighting alongside the "moderate jihadi opposition" to Assad;
There is plenty of weaponry and assorted supplies benefiting the "moderate jihadi opposition" that's come from UK, USA, France, Australia, Canada and half of EU.
AND ... that would mean that all these aforesaid countries have invaded Syria, right?

But, who gives a shit about logic these days, eh?
This is not saying that an invasion won't happen.  But, so far, at least overtly it has not .... just like in Syria and Iraq.  

I am beginning to like doublespeak ... especially Russia's, their accent sounds better.

From NYTimes:
Ukraine Asserts Russian Invasion and Reinstitutes Draft  
Asserting that Russian soldiers and armaments had crossed into Ukraine to support the separatists, President Petro O. Poroshenko of Ukraine canceled a trip to Turkey on Thursday, and his national security council ordered mandatory conscription for the armed forces.
“Columns of heavy artillery, huge loads of arms and regular Russian servicemen came to the territory of Ukraine from Russia through the uncontrolled border area,” Mr. Poroshenko said at the beginning of an emergency meeting of the Ukrainian Nation Security and Defense Council in Kiev.
Mercenaries, along with regular servicemen, were trying to overrun positions held by the Ukrainian military, he said, according to a statement on his official website.....

And, then we have the case of  "lost in translation"  from what Ukraine's Poroshenko actually said and what the Western media understood it to be.  LOL !

From ZeroHedge:
Ukraine Accuses Russia Of Launching Invasion, Then Promptly Retracts

It has been a busy morning: following a substantial surge in Ukraine separatist activity in the past 24 hours, which saw them capture the strategic Sea of Azov port town of Novoazovsk, a move which the NYT classified as "Ukraine Reports Russian Invasion on a New Front", Ukraine has turned on the disinformation spigot to max resulting in a constant verbal, and headline, diarrhea as follows:

POROSHENKO CONVENES SECURITY COUNCIL ON RUSSIAN `INVASION'
POROSHENKO: SITUATION IN UKRAINE'S EAST DETERIORATED SHARPLY
UKRAINE EU AMBASSADOR CALLS FOR JOINT EFFORT TO `STOP THIS WAR'
POROSHENKO SAYS SECURITY COUNCIL WILL DRAW UP FURTHER PLANS
RUSSIAN ARMY CONTROLS NOVOAZOVSK: UKRAINE SECURITY COUNCIL
YATSENYUK URGES UN SECURITY COUNCIL TO DEBATE UKRAINE SITUATION

So sure was Ukraine that this time (unlike all those previous disinformation launches) Russia has invaded that Anton Herashchenko, adviser to Ukrainian Interior Ministry, actually commented on his Facebook page saying "Invasion of regular Russian army of Putin to Ukraine is an accomplished fact,” Adding that Putin "de-facto places Ukraine on a war-footing at a time when a decree was signed to dissolve parliament."..........

.......But where things once again got surreal, making everyone not only laugh but wonder how the CIA has lost the plotline so badly, was the following "clarification" headline from Reuters, which noticed some rather substantial change in the language on the website of the Ukraine president:

CORRECTED-UKRAINIAN PRESIDENT POROSHENKO SAYS RUSSIAN TROOPS HAVE BEEN BROUGHT INTO UKRAINE (NOT 'RUSSIAN MILITARY INVASION HAS TAKEN PLACE') - PRESIDENTIAL WEBSITE

Indeed, instead of explicitly saying a "Russian military invasion has taken place", the website now reads: "I have made a decision to cancel my working visit to the Republic of Turkey due to sharp aggravation of the situation in Donetsk region, particularly in Amvrosiivka and Starobeshevo, as Russian troops were actually brought into Ukraine," the President noted."..............