It would appear this claim is based on one source: Constantiniu, Florin, O istorie sinceră a poporului român An Honest History of the Romanian People), Ed. Univers Enciclopedic, București, 1997, ISBN 973-9243-07-X (in Romanian)
Near as I can tell, this assertion would have the war in Europe ending in November, 1945 (that is, after the surrender of Japan). I would very much like to know the calculus Dr. Constantiniu used to arrive at his figure of 6 months – 7 months after the Russians and US Army met up on the Elbe.
Why this 6-month value would be true is somewhat mysterious (to me). The Romanian army was ill-equipped to hold off the Russians in any case. Any Romanian defense of the homeland would have been crushed. Romania’s main tank in 1944 was the R-35, with its 47mm cannon, whose shells would be shrugged off by T-34’s. Romania had some few captured Russian tanks, but with very limited ammunition. Russian artillery dwarfed that available to Romanian units. The Romanian Army - when Romania changed sides - were driving their redoubtable R-35s would still have been useless against Pz-4s, and anything better.
The Romanian Air Force in 1944 was flying IAR 80’s, which were about even with a 1940 Me-109E or Hurricane-1, but nothing newer. A measure of its value is that as soon as the Russians took over in Romania, almost all IAR 80’s were scrapped and replaced by Russian-built aircraft, which were all superior. The Soviets were able to maintain air supremacy until Romania gave up.
The Romanians declared a ‘unilateral cease fire’ (actually an unconditional surrender), when the Russians were already rolling into the country, brushing aside Romanian and German defenses. A month after the Romanian ‘cease fire’, the entire country was controlled by the Red Army.
It might be injurious to Romanian pride, but by 1944, Romania just plain wasn’t a major player in the war. Their best units had been obliterated long since on the Eastern Front. Their only real defense was provided by (weak) German units, who were brushed aside not quite as fast as the Romanian units.
Oh, and just because it’s in Wikipedia, doesn’t mean its true.