French president admits no consensus exists on such a move as he urges fellow European leaders to take action rather than wait for US aid
French president admits no consensus exists on such a move as he urges fellow European leaders to take action rather than wait for US aid
Without an official “Declaration of War” by either side, active troops can and have in the past been deployed to warring counties.
Perfect example: The Korean War.
China sent tens of thousands of “volunteers” from their Army to fight the Americans in the Korean war. They weren’t just volunteering though, they were fighting without an official Declaration of War. America, still cocky from WW2 and heavily under the influence of McCarthyism didn’t care either way.
Americans suffer a form of collective amnesia about the Korean conflict for many reasons, but the Chinese PRC has had a disdain for US for it ever since.
So yes, assuming no Country officially Declares war as a result of the action, any Country can send in troops into the fight. It’s a fools game as to what will be the result though.