Our Dutch friends are not alone with this problem. Dutch intel warned in April this year of Russia ramping up hybrid attacks against the Netherlands and the rest of Europe.
Another reminder why Europe needs to wake up, and that a substantial part of Nato countries' defense spending is dedicated to non-military defense such exactly these bombings, arson attacks, inflammable parcels, and similar violence against the population.
I just posted some reports in another thread, and it fits also here:
In May 2025, a report titled, "Testing the waters: Suspected Russian activity challenges Europe’s support for Ukraine", listed 190 events since 2022 across Europe (you'll find tables and map in the article), ranging from arson to cyber attacks, form jamming to vandalism, from flammable parcels to drone overflights, and form physical attacks to spying. The report states that the real number is probably higher than the reported 190.
Another investigation in the UK released just in July 2025 shows a massive surge in arson attacks in London neighbourhoods in 3 years as arson offences across the city have increased by 28 per cent, from 1,894 incidents reported in 2022 to 2,430 recorded in 2024, according to data published by the London Assembly. A quarter of those involved people aged 17 and under, according to the London Fire Brigade.
In April this year, Chinese officials have implicitly acknowledged responsibility for a series of sophisticated cyber intrusions targeting critical U.S. infrastructure as representatives from China’s Ministry of Foreign Affairs indirectly linked years of computer network breaches at U.S. ports, water utilities, airports, and other critical targets to increasing U.S. policy support for Taiwan.
This is just a start. You'll find much more across many independent sources.