Michael Schwirtz

After Russian drones entered Poland, the country scrambled to shoot them down. Western officials concluded that the incursion was to probe their defenses.

The Polish military called the incursions an “act of aggression.” Poland and NATO air forces launched warplanes to respond, the Polish military said.

Talks of a cease-fire in Ukraine have centered on the Donbas, a valued region for both sides and where most of the fighting is taking place. Michael Schwirtz, a global intelligence correspondent, and Anatoly Kurmanaev, a foreign correspondent covering Russia, break down who the Donbas is important to and why.

As negotiations over the war carry on, President Vladimir V. Putin is pushing hard with tactics that have evolved over three and a half years.

Almost six months after a stormy encounter with President Trump, the Ukrainian president returned for high-stakes talks bringing allies and a new approach.

President Volodymyr Zelensky of Ukraine had a remarkably different White House visit on Monday than the ambush he walked into six months ago. Michael Schwirtz, the global intelligence correspondent for The New York Times, explains how President Zelensky courted President Trump and managed to put the ball back in Vladimir V. Putin’s court.

Russia’s intelligence services turned Brazil into an assembly line for deep-cover operatives. A team of federal agents from the South American country has been quietly dismantling it.

The American president stepped up his warnings about Moscow’s plans after seeing evidence that an attack on Ukraine was imminent.

The U.S. response was not made public but Secretary of State Antony J. Blinken said it contained “core principles” on Ukraine’s sovereignty.

A forensic analysis of birth certificates used by deep-cover operatives suggests a tantalizing possibility.

Los servicios de inteligencia rusos hicieron de Brasil un semillero de agentes encubiertos. Un equipo de agentes federales del país sudamericano ha estado desmantelándolo silenciosamente.

The messages offer a glimpse at life deep undercover. Our correspondents break down four revealing exchanges.

New attacks on infrastructure and fears of a cold winter could drive even more Ukrainians to flee their homes, adding to what the U.N. says is the largest displacement crisis in decades.

Russia Plans a Huge Increase in Size of Its Military, Signaling a Long Fight  The New York Times

The assignment was part of a new program aimed at suspected Russian sabotage. None has occurred since NATO began patrols.

After a series of suspicious cable cuttings feared to be Russian sabotage, NATO began a new mission called Baltic Sentry to patrol the Baltic Sea. Michael Schwirtz, an investigative reporter with the International desk at The New York Times, takes us aboard one of these patrol flights.

Officials say the halt in assistance is a warning to the Ukrainians of the consequences of not cooperating with the president.

European officials were not sure what to make of the secretary of state’s measured assessment of Washington’s apparent pivot toward Moscow.

A senior Ukrainian intelligence official confirmed the plot to blow up drone goggles. But it was unclear how much effect the scheme had on Russian forces.

Corea del Norte envió sus mejores soldados para ayudar a Rusia en su guerra contra Ucrania. Pero tras sufrir graves pérdidas durante meses, han sido retiradas de la línea del frente.