Ah, but that was way back in 2014- take a look at the President in Ukraine at the time of the article. There's plenty of evidence that the Ukrainian government was far weaker militarily back then. Quoting from an article written by former Swiss Intelligence Officer Jacques Baud:
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Let’s try to examine the roots of the conflict. It starts with those who for the past eight years have been talking to us about “separatists” or “independence” from the Donbass. It’s wrong. The referendums conducted by the two self-proclaimed republics of Donetsk and Luhansk in May 2014 were not ” independence ” (независимость) referendums , as some unscrupulous journalists claimed , but ” self-determination ” or ” autonomy (самостоятельность). The term “pro-Russian” suggests that Russia was a party to the conflict, which was not the case, and the term “Russian speakers” would have been more honest. Moreover, these referendums were conducted against the advice of Vladimir Putin.
In fact, these republics did not seek to separate from Ukraine, but to have a statute of autonomy guaranteeing them the use of the Russian language as an official language. Because the first legislative act of the new government resulting from the overthrow of President Yanukovych, was the abolition, on February 23, 2014, of the Kivalov-Kolesnichenko law of 2012 which made Russian an official language. A bit as if putschists decided that French and Italian would no longer be official languages in Switzerland.
This decision causes a storm in the Russian-speaking population. This resulted in fierce repression against the Russian-speaking regions (Odessa, Dnepropetrovsk, Kharkov, Lugansk and Donetsk) which began in February 2014 and led to a militarization of the situation and a few massacres (in Odessa and Mariupol, for the most important). At the end of summer 2014, only the self-proclaimed republics of Donetsk and Lugansk remained.
At this stage, too rigid and stuck in a doctrinaire approach to the operational art, the Ukrainian staffs suffered the enemy without succeeding in imposing themselves. Examination of the course of the fighting in 2014-2016 in the Donbass shows that the Ukrainian general staff systematically and mechanically applied the same operational plans. However, the war waged by the autonomists was then very close to what we observed in the Sahel: very mobile operations carried out with light means. With a more flexible and less doctrinaire approach, the rebels were able to exploit the inertia of the Ukrainian forces to “trap” them repeatedly.
In 2014, I am at NATO, responsible for the fight against the proliferation of small arms, and we are trying to detect Russian arms deliveries to the rebels in order to see if Moscow is involved. The information that we receive then comes practically all from the Polish intelligence services and does not “match” with the information from the OSCE: in spite of rather crude allegations, we do not observe any delivery of arms and materials Russian military.
The rebels are armed thanks to the defections of Russian-speaking Ukrainian units which cross over to the rebel side. As the Ukrainian failures progressed, the entire tank, artillery or anti-aircraft battalions swelled the ranks of the autonomists. This is what drives the Ukrainians to commit to the Minsk Accords.
But, just after signing the Minsk 1 Accords, Ukrainian President Petro Poroshenko launched a vast anti-terrorist operation (ATO/Антитерористична операція) against Donbass. Bis repetita placent : poorly advised by NATO officers, the Ukrainians suffered a crushing defeat at Debaltsevo which forced them to commit to the Minsk 2 Agreements…
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Source:
Jacques Baud, a NATO expert, denounces western coverage of the Ukraine invasion.
scheerpost.com
As can be seen, at this stage of the Ukraine military, they were so weak that they couldn't even deal with the rebels in the Donbass, who apparently weren't even being armed by Russia at the time. I don't have the precise timeline, but I imagine it was only after this second crushing defeat that NATO and the U.S. started seriously arming Ukraine.