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Ukraine In Critical Situation In Key City Of Kostyantynivka
In today’s deep dive, we analyse the deteriorating frontline at Kostyantynivka as Russian infiltrations continue.
THE BRIEFING
Here’s what’s happening in geopolitics today.
Global headlines today move from tragedy to high diplomacy, with a deadly shooting at a San Diego mosque prompting investigations while China prepares a rare back-to-back diplomatic balancing act hosting both Trump and Putin within days.
In parallel, Washington is tightening pressure in the Caribbean with new Cuba sanctions even as Gulf tensions remain elevated following reports of a postponed Iran strike and ongoing uncertainty around negotiations. Meanwhile, Taiwan is watching closely as it cautiously awaits US arms decisions that could reshape the regional military balance, adding another layer to an already fast-moving geopolitical backdrop.
In today’s deep dive, we analyse the deteriorating frontline at Kostyantynivka as Russian infiltrations continue.
THE LAST 24 HOURS IN GEOPOLITICS
1. Shooters kill three people at San Diego mosque in suspected hate crime
Three people were killed after two teenage gunmen opened fire at the Islamic Center of San Diego, with U.S. authorities investigating the attack as a suspected hate crime. San Diego police said the suspects, aged 17 and 18, were later found dead from apparent self-inflicted gunshot wounds, while investigators cited anti-Islamic rhetoric and writings linked to the attackers. The shooting has prompted increased security around mosques in several U.S. cities and renewed concerns over rising religiously motivated violence targeting places of worship.
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2. Xi prepares to welcome Putin to China four days after hosting Trump
Chinese President Xi Jinping is preparing to host Vladimir Putin in Beijing just four days after welcoming Donald Trump for high-level talks, highlighting China’s increasingly central role in global diplomacy. Putin’s visit is expected to focus on deepening China-Russia strategic and energy cooperation, including discussions around the proposed Power of Siberia 2 gas pipeline and broader geopolitical coordination. The back-to-back meetings with Washington and Moscow come as Beijing seeks to position itself as a stable global power broker.
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3. US imposes new Cuba sanctions as Caribbean tensions rise
The United States has imposed a new round of sanctions on Cuban political and military officials as tensions across the Caribbean continue to rise under the Trump administration’s expanded pressure campaign. US authorities said the measures target senior Cuban figures and state-linked entities accused of supporting regional destabilisation and maintaining close ties with sanctioned governments, including Venezuela. The sanctions come amid growing diplomatic strain, increased US military activity in the region and concerns over worsening economic conditions inside Cuba.
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4. Trump says Iran attack postponed at request of Gulf allies
Donald Trump said a planned military strike on Iran was postponed after leaders from Saudi Arabia, Qatar and the UAE urged Washington to allow more time for diplomacy. Trump said “serious negotiations” are now underway following the delivery of a revised Iranian proposal through intermediaries, though he warned that military action remains an option if talks fail. The delay comes amid continued tensions across the Gulf, including recent drone incidents.
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5. Taiwan ‘cautiously optimistic’ about US arms sales, defence minister says
Taiwan’s Defence Minister Wellington Koo said Taipei is “cautiously optimistic” that the United States will continue approving major arms sales despite recent uncertainty following Donald Trump’s talks with Chinese President Xi Jinping. Taiwan views continued US weapons deliveries as essential for deterring Chinese military pressure, particularly as Beijing continues large-scale naval and air operations around the island. The comments come as Washington weighs a pending multi-billion-dollar arms package for Taiwan, with the issue emerging as a key point of tension in broader US-China relations.
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CONFLICT TRACKER
Russia-Ukraine
AMK_Mapping assessment
Russian forces intensified assault and infiltration operations around Kostyantynivka, with the situation for Ukrainian defenders reportedly deteriorating across multiple sectors.
In the west, Russian troops improved positions east of Stepanivka and advanced toward Dovha Balka. Ukrainian forces managed to clear southern parts of Dovha Balka and launched localised counterattacks in southeastern sections of the village and northeastern Stepanivka, where fighting remains fluid.
To the south and southeast, Russian forces advanced through Illinivka, capturing much of the settlement before infiltrating western high-rise districts of Kostyantynivka and pushing toward the Kryvyi Torets River. Additional infiltrations are occurring from Berestok and the Kleban-Bykske Reservoir, threatening Ukrainian positions in the southern suburbs with operational encirclement.
Further east, Russian troops secured the university complex on the southern edge of the city and expanded infiltrations into industrial zones and southwestern residential districts. In the northeast, Ukrainian troops recaptured several blocks near the highway, while Russian forces seized forest areas east of the city, entered parts of the Hora District, captured southern Dmytrivka, and infiltrated toward Molocharka and northern suburbs. Fighting also intensified near Stupochky and Chasiv Yar, where Ukraine regained limited ground before renewed Russian counterattacks.

My Comments
What we are seeing is a classic repeat of what Russia appears to have “perfected” when it comes to capturing key urban centres. This is increasingly resembling the second half of the Pokrovsk offensive: gradual infiltration through defensive gaps, followed by sudden frontal assaults.
The reality is that Ukrainian soldiers are struggling to hold defensive positions inside urban areas. Historically, cities are some of the strongest defensive nodes an army can use, so why is this happening? There are two main reasons. First, Ukraine cannot plug every gap quickly enough, as the scale of Russian infiltrations has become overwhelming. Second, Russian FAB-UMPK and KAB glide bombs are relentlessly striking the city, often equipped with thermobaric warheads. This means that hiding inside buildings or fortified structures no longer guarantees safety.
A major factor contributing to the deteriorating situation is the catastrophic supply line issue. There is effectively only one major road leading into the city, and Russia has maintained near-total drone and fire control over it for months. One of the few remaining methods of moving supplies into the city is through UGVs, which, while cost-effective, are highly vulnerable once detected.
Another important factor is the eastern flank. Ukrainian forces have done a remarkable job defending the Chasiv Yar sector, the linchpin of this front. However, as has repeatedly happened elsewhere, a gap emerged near Illinivka and was quickly exploited. This now places Ukrainian defenders near Chasiv Yar in a difficult position: hold their ground or withdraw. The problem is compounded by terrain. Russia controls the heights to the northwest, meaning any retreat or large-scale movement is likely to be spotted and targeted.
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